# A091039 (b-file synthesized from sequence entry) 1 1 2 3 3 1 4 7 5 8 6 1 7 15 8 52 9 30 10 1 11 31 12 320 13 756 14 144 15 1 16 63 17 1936 18 18360 19 17856 20 840 21 1 22 127 23 11648 24 441936 25 2156544 26 619200 27 5760 28 1 29 255 30 69952 31 10614240 32 259117056 33 447552000 34 29548800 35 45360 36 1 37 511 38 419840 39 254788416 40 31102009344