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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”).

A137907 as a simple table

na(n)
11
21
39
46
59
624
74
87
928
1070
1173
12121
13511
14106
15343
162169
171423
182146
195736
204444
212484
222310
232679
2425623
252481
2639213

[1,1,9,6,9,24,4,7,28,70,73,121,511,106,343,2169,
 1423,2146,5736,4444,2484,2310,2679,25623,2481,
 39213]