# A067311 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 1 4 5 5 6 6 3 7 1 8 14 9 28 10 28 11 20 12 10 13 4 14 1 15 42 16 120 17 180 18 195 19 165 20 117 21 70 22 35 23 15 24 5 25 1 26 132 27 495 28 990 29 1430 30 1650 31 1617 32 1386 33 1056 34 726 35 451 36 252 37 126 38 56 39 21 40 6 41 1 42 429 43 2002 44 5005 45 9009 46 13013 47 16016 48 17381 49 16991 50 15197 51 12558 52 9646 53 6916 54 4641