# 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