# A149198 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 10 4 38 5 127 6 498 7 1863 8 7543 9 29856 10 124254 11 509212 12 2164118 13 9089475 14 39239286 15 167827362 16 733433910 17 3180579412 18 14038447686 19 61547774679 20 273888893696 21 1211561695921 22 5428227733799 23 24191188359499 24 109009188494274 25 488859750270041 26 2213761086799447 27 9981081059614057