# A139415 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 8 4 40 5 208 6 1408 7 12224 8 157312 9 3478528 10 147761664 11 12592434176 12 2112188653568 13 680441850810368 14 415073848421801984 15 476853486273606582272 16 1030736815796444156755968 17 4196432048875514376435007488 18 32243698461915435195120257335296