# A001194 (b-file synthesized from sequence entry) 2 3 3 9 4 54 5 450 6 4725 7 59535 8 873180 9 14594580 10 273648375 11 5685805125 12 129636356850 13 3217338674550 14 86331921100425 15 2490343877896875 16 76844896803675000 17 2525635608280785000 18 88081541838792376875 19 3248654513701342370625