# A208649 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 3 5 6 6 40 7 150 8 2100 9 14700 10 423360 11 5556600 12 325987200 13 8068183200 14 958961203200 15 44996257706400 16 10799101849536000 17 965169727802280000 18 466713183932835840000 19 79775138681769651120000