# A149210 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 10 4 40 5 138 6 551 7 2157 8 8810 9 36647 10 154078 11 661375 12 2854646 13 12490169 14 55043299 15 244367746 16 1093384878 17 4915059946 18 22237882646 19 101035126126 20 461173650726 21 2113656372476 22 9720476876090 23 44867012962344 24 207692597912237 25 964303906233908 26 4489064030758398 27 20948595168627176