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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”).

A147360 as a simple table

na(n)
11
21
31
41
525
6141
7756
810461
9137862
102668563
1189609916
123827996725
13213188142328

[1,1,1,1,25,141,756,10461,137862,2668563,89609916,
 3827996725,213188142328]