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A026635 as a simple table

na(n)
01
13
28
318
440
584
6174
7354
8716
91440
102890
115790
1211592
1323196
1446406
1592826
16185668
17371352
18742722
191485462
202970944
215941908
2211883838
2323767698
2447535420
2595070864
26190141754
27380283534
28760567096
291521134220
303042268470
316084536970
3212169073972

[1,3,8,18,40,84,174,354,716,1440,2890,5790,11592,
 23196,46406,92826,185668,371352,742722,1485462,
 2970944,5941908,11883838,23767698,47535420,
 95070864,190141754,380283534,760567096,1521134220,
 3042268470,6084536970,12169073972]