# A285044 (b-file synthesized from sequence entry)
0 1
1 50
2 550
3 4020
4 24710
5 138012
6 725340
7 3655080
8 17859270
9 85230860
10 399257716
11 1842353240
12 8396404380
13 37868584600
14 169278679800
15 750923914320
16 3308947546950
17 14495583969900
18 63172016823300
19 274031830241400
20 1183780040663220