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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.

A177398 O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^2 * x^n/n ).

Table of values

n a(n)
0 1
1 4
2 16
3 64
4 208
5 656
6 1984
7 5632
8 15520
9 41476
10 107312
11 271232
12 670464
13 1622160
14 3854208
15 9003264
16 20696640
17 46895248
18 104827472
19 231353984
20 504592448
21 1088323584
22 2322683072
23 4908033280
24 10273819136
25 21313971876
26 43843093488

List of values

[1, 4, 16, 64, 208, 656, 1984, 5632, 15520, 41476, 107312, 271232, 670464, 1622160, 3854208, 9003264, 20696640, 46895248, 104827472, 231353984, 504592448, 1088323584, 2322683072, 4908033280, 10273819136, 21313971876, 43843093488]

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

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