# A176991 (b-file synthesized from sequence entry) 1 2 2 2 3 6 4 2 5 10 6 20 7 2 8 14 9 35 10 70 11 2 12 18 13 56 14 126 15 252 16 2 17 22 18 83 19 210 20 462 21 924 22 2 23 26 24 116 25 330 26 792 27 1716 28 3432 29 2 30 30 31 155 32 494 33 1287 34 3003 35 6435 36 12870 37 2 38 34 39 200 40 710 41 2002 42 5005 43 11440 44 24310 45 48620 46 2 47 38 48 251 49 986 50 3002 51 8008 52 19448 53 43758 54 92378 55 184756