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A307308 as a simple table

na(n)
11
22
36
415
542
6106
7280
8702
91778
104398
1110910
1226678
1365172
14157656
15380524
16912846
172185906
185216588
1912433166
2029564544
2170189672
22166245574
23392909240
24926290066
252178881218
265114469170
2711985221654
2828049398284
2965588182636
30153277006212
31358073997608

[1,2,6,15,42,106,280,702,1778,4398,10910,26678,
 65172,157656,380524,912846,2185906,5216588,
 12433166,29564544,70189672,166245574,392909240,
 926290066,2178881218,5114469170,11985221654,
 28049398284,65588182636,153277006212,358073997608]