# A093835 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 9 4 20 5 55 6 126 7 301 8 680 9 1539 10 3410 11 7513 12 16380 13 35503 14 76454 15 163845 16 349520 17 742747 18 1572858 19 3320497 20 6990500 21 14680071 22 30758222 23 64312669 24 134217720 25 279620275 26 581610146 27 1207959561 28 2505397580 29 5189752159