# A009296 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 -2 4 -4 5 -4 6 24 7 176 8 272 9 -1712 10 -14528 11 -66912 12 181312 13 4737344 14 20265088 15 -53926656 16 -1771263744 17 -18559434496 18 4388386816 19 1869838374400 20 16325400792064 21 35429689535488 22 -1796402984175616 23 -36301265658269696