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A026653 as a simple table

na(n)
21
37
430
5148
6610
72823
811690
952952
10221094
11992190
124173708
1318642456
1478906516
15351537963
161495497690
176652572976
1828420125190
19126308309058
20541492971140
212405203008440
2210341957297084
2345920564571398
24197952999374468

[1,7,30,148,610,2823,11690,52952,221094,992190,
 4173708,18642456,78906516,351537963,1495497690,
 6652572976,28420125190,126308309058,541492971140,
 2405203008440,10341957297084,45920564571398,
 197952999374468]