# A100644 (b-file synthesized from sequence entry) 1 2 2 3 3 8 4 45 5 96 6 35 7 17280 8 14175 9 89600 10 149688 11 29030400 12 79625 13 402361344000 14 312741000 15 229605376 16 488462349375 17 83691159552000 18 50697046400 19 8604790260498432 20 1470076286679 21 29967718809600000 22 4694524604733600000 23 269760174666625843200000 24 5699209469078125