# A156565 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 2 6 1 7 2 8 3 9 6 10 1 11 3 12 8 13 21 14 24 15 1 16 4 17 15 18 104 19 105 20 120 21 1 22 5 23 24 24 315 25 1040 26 3255 27 720 28 1 29 6 30 35 31 744 32 5355 33 125840 34 9765 35 5040 36 1 37 7 38 48 39 1505 40 19344 41 1826055 42 880880 43 1240155 44 40320 45 1 46 8 47 63 48 2736 49 55685 50 15107664 51 23738715 52 962801840