# A149055 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 10 4 40 5 155 6 661 7 2809 8 12388 9 55098 10 249064 11 1135248 12 5225124 13 24208799 14 112873953 15 528935624 16 2489987847 17 11767157943 18 55803419262 19 265442664895 20 1266114276385 21 6053949599553 22 29011329072416 23 139305020533736 24 670130501757298 25 3229062672948896 26 15583269734938239 27 75310011395231900