# A024949 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 4 5 4 6 20 7 36 8 52 9 132 10 292 11 580 12 1252 13 2628 14 6772 15 14820 16 32404 17 75012 18 183108 19 423428 20 953924 21 2225028 22 5435604 23 12770340 24 29545076 25 69900164 26 170528612 27 405553988 28 954683428 29 2267938244 30 5585542964 31 13382224612 32 31793247188