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A054549
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Number of symmetric nonnegative integer 9x9 matrices with sum of elements equal to 4*n, under action of dihedral group D_4.
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0
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1, 9, 51, 219, 786, 2466, 6974, 18126, 43929, 100321, 217683, 451707, 901128, 1735752, 3239928, 5878328, 10393902, 17950878, 30340682, 50273658, 81787476, 130811124, 205935756, 319456044, 488764246, 738197766, 1101468114
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