# A075457 (b-file synthesized from sequence entry)
1 1
2 198
3 1070
4 2574
5 10769
6 66908
7 1036663
8 6436241
9 12745650
10 2253183029
11 81422343214
12 278747505724
13 352663623088
14 537668537432
15 807810573770
16 3169762558125
17 3623176921864
18 4225712901909
19 4395991005975
20 15435175116616
21 1361811565229752