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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A215439 as a simple table

na(n)
11
22
34
410
570
6134
7146
8190
9218
10292
11478
127136
1315964
1419988
15100790
16111442
17181874
18202112

[1,2,4,10,70,134,146,190,218,292,478,7136,15964,
 19988,100790,111442,181874,202112]