# Pastebin Gdm9wj9r
M =

   15328     220    1249    -367     147    -147    -177       0
     294    1029     220     808    -367       0    -103    -121
     367      73     294     -73      88    -103    -121       0
    -514    -367    -147       0       0       0       0       0
       0    -220    -265       0    -121       0       0       0
      73       0       0    -121       0       0       0       0
      88     103       0       0       0       0       0       0
       0       0       0       0       0       0       0       0

octave:2> idct2(M)
ans =

   2379.4   2404.5   1811.5   1677.7   1733.8   1850.3   1975.6   1883.0
   2624.7   2450.1   1807.8   1644.8   1680.6   1785.0   1914.0   1890.9
   2636.6   2471.1   2003.3   1787.8   1707.7   1768.7   1895.1   1938.1
   2063.8   2079.4   1954.1   1811.4   1736.9   1815.9   1931.5   1978.7
   1672.9   1709.0   1744.6   1712.5   1708.4   1755.6   1899.6   2027.4
   1728.4   1716.1   1745.3   1725.3   1656.6   1555.2   1869.1   2284.2
   1781.1   1829.3   1855.3   1817.3   1693.5   1488.7   1965.8   2594.3
   1882.4   1992.6   1993.1   1938.2   1845.2   1613.0   2073.5   2656.4