

A210905


Number of n X n 0..2 symmetric matrices with every element equal to zero or one horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order


0



1, 2, 24, 552, 27204, 2812168, 611509240, 279902590168, 269562004096692, 546187771866465456, 2328406266027562097220, 20883572160878878738558896, 394075725737300936910238275696
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