# A162960 (b-file synthesized from sequence entry) 0 1 1 9 2 72 3 576 4 4572 5 36288 6 288036 7 2286144 8 18145260 9 144020016 10 1143094932 11 9072809424 12 72011403324 13 571558593312 14 4536492984324 15 36006402202848 16 285784857170316 17 2268290625889680 18 18003551393278836 19 142895208872692080