# A351892 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 13 5 40 6 205 7 952 8 4921 9 31168 10 189145 11 1318528 12 9843781 13 74869888 14 632536933 15 5475991552 16 49996774897 17 485393809408 18 4829958877105 19 50858117779456 20 554544498995965 21 6259096187060224 22 73822470722135293 23 894846287081242624 24 11261265009125680681 25 146272258394568687616