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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”).

A146460 as a simple table

na(n)
11
21
31
41
55
625
787
8503
92831
1025037
11243793
123762955
1362868913
141572482009
1542577954723
161734990453303

[1,1,1,1,5,25,87,503,2831,25037,243793,3762955,
 62868913,1572482009,42577954723,1734990453303]