# A274244 (b-file synthesized from sequence entry) 0 1 1 4 2 34 3 494 4 8615 5 165550 6 3380923 7 71999763 8 1580990725 9 35537491360 10 813691565184 11 18911247654404 12 444978958424224 13 10579389908116344 14 253756528273411250 15 6133110915783398175 16 149219383150626519874 17 3651756292682801022384 18 89830021324956206790496 19 2219945238901447637080235 20 55088272581138888326634644