# A077633 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 6 5 30 6 14 7 462 8 30 9 924 10 62 11 360 12 126 13 88623545610600 14 254 15 5364840 16 510 17 214057116 18 1022 19 473045752778491241949600 20 2046 21 3968969477588889464597306400 22 4094 23 16579321550270765937400453704000