# A076551 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 66 4 210 5 3570 6 103740 7 930930 8 56812470 9 1722580860 10 32395433070 11 265257422430 12 91348974206490 13 8923863379851420 14 330196858581850260 15 14193386885746698630 16 2378522762792139793830 17 351206814022419685159830 18 28791787439593010836313310