# A002910 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 12 4 24 5 48 6 90 7 168 8 318 9 600 10 1098 11 2004 12 3696 13 6792 14 12270 15 22140 16 40224 17 72888 18 130650 19 234012 20 421176 21 756624 22 1348998 23 2403840 24 4299018 25 7677840 26 13635630 27 24206220 28 43092888 29 76635984 30 135698970 31 240199320 32 426144654 33 755420328 34 1334488074