# A157395 (b-file synthesized from sequence entry) 1 1 2 1 3 5 4 1 5 15 6 20 7 1 8 105 9 80 10 60 11 1 12 425 13 1200 14 300 15 120 16 1 17 3075 18 10400 19 5400 20 720 21 120 22 1 23 15855 24 102200 25 75600 26 15120 27 840 28 0 29 1 30 123515 31 1149120 32 907200 33 241920 34 20160 35 0 36 0 37 1 38 757755 39 12783680 40 13426560 41 3719520 42 362880