# A074439 (b-file synthesized from sequence entry) 1 0 2 0 3 3 4 18 5 60 6 214 7 1008 8 5280 9 29160 10 165840 11 940896 12 5196096 13 28304640 14 155270016 15 863910489 16 4861712448 17 27554100480 18 156728297088 19 892662156288 20 5088174124950 21 29045467518171 22 166186204664832 23 953309368018944 24 5481559804635648 25 31581437286776820