# A020125 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 17 5 81 6 468 7 3197 8 25043 9 221209 10 2175217 11 23564851 12 278850731 13 3578584369 14 49503750433 15 734305631413 16 11626505830702 17 195712848150141 18 3490212458677515 19 65732334638426517 20 1303691303662125906