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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”).

A031664 as a simple table

na(n)
1119797
2176521
3250169
4327409
5420193
6422789
7425393
8426698
9530345
10533261
11643645
12653305
13766154
14774929
15780218
16783754
17905026
18906929
19910741
20914561
21918389
22920306
23926069
241061629
251219657
261224077
271232941
281241837

[119797,176521,250169,327409,420193,422789,425393,
 426698,530345,533261,643645,653305,766154,774929,
 780218,783754,905026,906929,910741,914561,918389,
 920306,926069,1061629,1219657,1224077,1232941,
 1241837]