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A141506
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Number of n X n binary matrices, symmetric about the diagonal and under 90 degree rotation, with no more than 2 ones in any 2 X 2 subblock.
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1
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1, 2, 1, 5, 3, 25, 13, 205, 99, 2849, 1247, 66677, 26615, 2633485, 954340, 175143651, 57733315, 19638725775, 5882854746, 3710411382331, 1010373532123, 1181447019186469, 292421578705864, 633957805831439213, 142628031886778979
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