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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A268136 a(n) = (3/n)*Sum_{k=0..n-1} A245769(k)^2.

Table of values

n a(n)
1 3
2 3
3 51
4 507
5 4947
6 58243
7 841443
8 14240763
9 269512483
10 5524472451
11 120183938835
12 2738420763131
13 64760819179635
14 1579226738429187
15 39515677808716739
16 1010750709382934523
17 26349289260686093379
18 698387854199468231427
19 18783213754115549685747
20 511772677524431483886075

List of values

[3, 3, 51, 507, 4947, 58243, 841443, 14240763, 269512483, 5524472451, 120183938835, 2738420763131, 64760819179635, 1579226738429187, 39515677808716739, 1010750709382934523, 26349289260686093379, 698387854199468231427, 18783213754115549685747, 511772677524431483886075]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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