# A185275 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 3 4 15 5 15 6 105 7 105 8 945 9 945 10 10395 11 3465 12 45045 13 45045 14 675675 15 675675 16 11486475 17 11486475 18 218243025 19 43648605 20 916620705 21 916620705 22 21082276215 23 2342475135 24 58561878375 25 58561878375 26 1581170716125 27 225881530875 28 6550564395375 29 6550564395375