# A203317 (b-file synthesized from sequence entry) 1 1 2 2 3 8 4 256 5 10240 6 3440640 7 1233125376 8 4058744094720 9 286551971651911680 10 13351029463205868994560 11 18128348229848045861669437440 12 80945830355202461675325011924090880 13 223346912509970707926726595810215906508800