# A005452 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 25 4 219 5 1978 6 18395 7 171529 8 1601725 9 14956266 10 139629194 11 1303138445 12 12157779067 13 113382522382 14 1056867697737 15 9843661720634 16 91532722388023 17 846837132071729 18 7668156860181597