# A004370 (b-file synthesized from sequence entry) 2 1 3 21 4 378 5 6545 6 111930 7 1906884 8 32468436 9 553270671 10 9440350920 11 161322559475 12 2761025887620 13 47325339895743 14 812325612855848 15 13961746143269400 16 240260199935164200 17 4139207762053520646