# A017575 (b-file synthesized from sequence entry) 0 16384 1 268435456 2 13492928512 3 163840000000 4 1028071702528 5 4398046511104 6 14645194571776 7 40867559636992 8 100000000000000 9 221068140740608 10 450766669594624 11 860542568759296 12 1555363874947072 13 2684354560000000 14 4453476124377088 15 7140436495826944 16 11112006825558016