# A002772 (b-file synthesized from sequence entry) 2 2 3 6 4 22 5 101 6 546 7 3502 8 25586 9 214062 10 1987516 11 20599076 12 232482372 13 2876191276 14 38228128472 15 549706132536 16 8408517839416 17 137788390312712 18 2383879842920976 19 43846851982943152 20 846470648320690736 21 17266870434276713616 22 367937854493289655072