# A049977 (b-file synthesized from sequence entry) 1 1 2 3 3 4 4 11 5 20 6 50 7 93 8 185 9 368 10 920 11 1748 12 3453 13 6876 14 13743 15 27479 16 54957 17 109912 18 274780 19 522082 20 1030428 21 2053989 22 4104555 23 8207405 24 16413982 25 32827412 26 65654641 27 131309190 28 262618337 29 525236644 30 1050473279 31 2100946551 32 4201893101 33 8403786200 34 21009465500 35 39917984450