# A026163 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 16 5 45 6 126 7 356 8 1008 9 2862 10 8140 11 23188 12 66144 13 188916 14 540216 15 1546560 16 4432512 17 12717513 18 36526626 19 105016686 20 302228080 21 870613689 22 2510249302 23 7244285436 24 20924179920 25 60487084775 26 174994990326 27 506669921982