# A266911 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 2 5 2 6 60 7 3 8 10 9 42 10 60 11 30 12 252 13 4 14 8 15 231 16 210 17 2 18 5460 19 42 20 660 21 1260 22 840 23 210 24 7956 25 396 26 440 27 228 28 120 29 24 30 720720 31 2145 32 510 33 14490 34 180 35 330 36 17117100 37 36036 38 360 39 378 40 26180 41 3740 42 3483480 43 5460 44 83720 45 5442360 46 1755600 47 2310 48 2187900 49 2652 50 17160 51 13860 52 3960 53 440