# A156564 (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 40 13 35 14 24 15 1 16 4 17 165 18 8372 19 1755 20 120 21 1 22 5 23 456 24 159831 25 17174080 26 382075 27 720 28 1 29 6 30 1015 31 1387064 32 2572040925 33 329455658840 34 354205467 35 5040 36 1 37 7 38 1968 39 7773755 40 107605514016 41 670559078523807 42 57782732285824000 43 1368556206875 44 40320