# A109437 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 12 4 44 5 165 6 615 7 2296 8 8568 9 31977 10 119339 11 445380 12 1662180 13 6203341 14 23151183 15 86401392 16 322454384 17 1203416145 18 4491210195 19 16761424636 20 62554488348 21 233456528757 22 871271626679 23 3251629977960 24 12135248285160 25 45289363162681 26 169022204365563 27 630799454299572