login

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”).

A201840 as a simple table

na(n)
10
21
31
43
51
69
77
825
925
1083
1185
12277
13327
14965
151267
163479
174933
1812713
1919267
2047079
2175269
22176317
23294185
24665893
251149735
262531711
274492395
289677791
2917552673
3037160277
3168590367
32143219187
33268096983
34553710855
351048276003
362146430287

[0,1,1,3,1,9,7,25,25,83,85,277,327,965,1267,3479,
 4933,12713,19267,47079,75269,176317,294185,665893,
 1149735,2531711,4492395,9677791,17552673,37160277,
 68590367,143219187,268096983,553710855,1048276003,
 2146430287]