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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.

A204271 a(n) = sigma(n)*Pell(n), where sigma(n) = A000203(n), the sum of divisors of n.

Table of values

n a(n)
1 1
2 6
3 20
4 84
5 174
6 840
7 1352
8 6120
9 12805
10 42804
11 68892
12 388080
13 468454
14 1938768
15 4680600
16 14595792
17 20460402
18 107024190
19 132502180
20 671765976
21 1235646880
22 3356004888
23 5401408344
24 32600383200
25 40663881751
26 133006270404
27 305814801800

List of values

[1, 6, 20, 84, 174, 840, 1352, 6120, 12805, 42804, 68892, 388080, 468454, 1938768, 4680600, 14595792, 20460402, 107024190, 132502180, 671765976, 1235646880, 3356004888, 5401408344, 32600383200, 40663881751, 133006270404, 305814801800]

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

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