# A173210 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 4 5 1 6 84 7 36 8 9 9 1 10 4584 11 1056 12 144 13 16 14 1 15 469440 16 73200 17 6000 18 400 19 25 20 1 21 76982940 22 9179640 23 537300 24 22800 25 900 26 36 27 1 28 18391183020 29 1794887640 30 83163780 31 2598960 32 67620 33 1764 34 49 35 1 36 6011375932800 37 500614248960 38 19475406720