# A074621 (b-file synthesized from sequence entry) 0 2 1 15 2 117 3 945 4 7857 5 66825 6 578097 7 5062905 8 44726337 9 397498185 10 3547250577 11 31743856665 12 284606318817 13 2554926522345 14 22955156619057 15 206361317079225 16 1855841298759297 17 16694108359111305 18 150196195253667537