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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”).

A378957 as a simple table

na(n)
01
11
25
341
4399
54263
648335
7571061
86953854
986659366
101099882862
1114168133882
12184756656826
132434227814578
1432354612273352
15433312539103431
165841624625609747
1779211315586085551
181079630126313403483
1914782787622359779197
20203248589087860373309
212804882047701189052925

[1,1,5,41,399,4263,48335,571061,6953854,86659366,
 1099882862,14168133882,184756656826,2434227814578,
 32354612273352,433312539103431,5841624625609747,
 79211315586085551,1079630126313403483,
 14782787622359779197,203248589087860373309,
 2804882047701189052925]