# A337352 (b-file synthesized from sequence entry) 0 1 1 20 2 524 3 19660 4 854380 5 40304080 6 2004409236 7 103440770760 8 5486614131756 9 297239307415792 10 16376472734974384 11 914734188877259884 12 51680064605716043636 13 2948046519564292501232 14 169560941932509940657016 15 9822377923336683964009296 16 572554753384166308597716396