# A062960 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 16 4 65 5 576 6 2275 7 27840 8 78489 9 236800 10 767151 11 13264560 12 31184725 13 640564848 14 2082421125 15 5514535936 16 10924376001 17 279876280320 18 584912713825 19 16888996800000 20 37538691697521 21 91766133606400 22 272224952406045 23 9248286151802880 24 17279191734765625