# A145890 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 2 5 6 6 5 7 4 8 6 9 20 10 14 11 10 12 12 13 20 14 70 15 42 16 28 17 30 18 40 19 70 20 252 21 132 22 84 23 84 24 100 25 140 26 252 27 924 28 429 29 264 30 252 31 280 32 350 33 504 34 924 35 3432 36 1430 37 858 38 792 39 840 40 980 41 1260 42 1848 43 3432 44 12870 45 4862 46 2860 47 2574 48 2640 49 2940 50 3528 51 4620 52 6864 53 12870 54 48620