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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”).

A153699 as a simple table

na(n)
11
21
31
42
53
68
715
8264
9334
10465
11683
12713
13758
148741
1515912
1618920
1738560
18409895

[1,1,1,2,3,8,15,264,334,465,683,713,758,8741,
 15912,18920,38560,409895]