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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”).

A280957 as a simple table

na(n)
111
2205
31554
414106
5126267
61121528
79986376
888940022
9791997382
107052519878
1162801413162
12559236961207
134979918315253
1444345374930680
15394888443546716
163516418473800700
1731313145020210260
18278838553941378885

[11,205,1554,14106,126267,1121528,9986376,
 88940022,791997382,7052519878,62801413162,
 559236961207,4979918315253,44345374930680,
 394888443546716,3516418473800700,
 31313145020210260,278838553941378885]