# A077849 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 21 4 54 5 138 6 352 7 897 8 2285 9 5820 10 14823 11 37752 12 96148 13 244872 14 623645 15 1588311 16 4045140 17 10302237 18 26237926 19 66823230 20 170186624 21 433434405 22 1103878665 23 2811378360 24 7160069791 25 18235396608 26 46442241368 27 118279949136 28 301237536249 29 767197263003