# A174005 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 2 5 1 6 12 7 8 8 3 9 1 10 52 11 30 12 12 13 4 14 1 15 360 16 260 17 60 18 16 19 5 20 1 21 2656 22 2562 23 780 24 108 25 20 26 6 27 1 28 20160 29 23408 30 8568 31 1768 32 180 33 24 34 7 35 1 36 177472 37 262950 38 94752 39 20580 40 3380 41 282 42 28 43 8 44 1 45 1814400 46 3594620 47 1467840 48 277984 49 41160 50 5772 51 420 52 32 53 9 54 1