# A056097 (b-file synthesized from sequence entry) 1 6 2 8 3 30 4 36 5 44 6 156 7 696 8 944 9 2800 10 2928 11 3600 12 6660 13 16064 14 195456 15 260864 16 784128 17 4189184 18 12573696 19 201289728 20 17179541504 21 274876596224 22 824631361536