# A219358 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 8 4 46 5 334 6 2882 7 28604 8 320248 9 3993184 10 54942740 11 828086732 12 13586200504 13 241294019584 14 4615319816192 15 94629675177320 16 2070911506927360 17 48185049542009248 18 1187816429730925424 19 30923773410431125424 20 847808674826433774928 21 24414218135569507213312