# A066584 (b-file synthesized from sequence entry) 1 1 2 15 3 63 4 3 5 315 6 120 7 2268 8 102060 9 241920 10 2953125 11 51438240 12 145212480 13 5290790400 14 76545 15 945 16 15120 17 1071630 18 26127360 19 106312500 20 1050197400 21 95591301120 22 1339231320 23 76204800 24 3135283200 25 3511517184000