# A259456 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 6 4 20 5 15 6 24 7 130 8 210 9 105 10 120 11 924 12 2380 13 2520 14 945 15 720 16 7308 17 26432 18 44100 19 34650 20 10395 21 5040 22 64224 23 303660 24 705320 25 866250 26 540540 27 135135 28 40320 29 623376 30 3678840 31 11098780 32 18858840 33 18288270 34 9459450 35 2027025 36 362880 37 6636960 38 47324376 39 177331440 40 389449060 41 520059540 42 416215800