# A304991 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 10 5 21 6 44 7 75 8 132 9 240 10 420 11 672 12 1155 13 1818 14 2970 15 4752 16 7392 17 11286 18 17710 19 26460 20 40128 21 60192 22 89178 23 130520 24 192150 25 278036 26 401940 27 577920 28 825396 29 1168640 30 1658784 31 2326280 32 3256110 33 4544064 34 6302720 35 8706555 36 12008636 37 16444120 38 22476960