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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.

A356039 a(n) = Sum_{k=1..n} binomial(n,k) * sigma_3(k).

Table of values

n a(n)
1 1
2 11
3 58
4 243
5 866
6 2804
7 8485
8 24387
9 67333
10 180086
11 469338
12 1196976
13 2996956
14 7385837
15 17954243
16 43125267
17 102494548
18 241309031
19 563341508
20 1305142418
21 3002938045
22 6866090880
23 15609292379
24 35299794600
25 79443050541
26 177989130174
27 397124963671
28 882642816697
29 1954708794400

List of values

[1, 11, 58, 243, 866, 2804, 8485, 24387, 67333, 180086, 469338, 1196976, 2996956, 7385837, 17954243, 43125267, 102494548, 241309031, 563341508, 1305142418, 3002938045, 6866090880, 15609292379, 35299794600, 79443050541, 177989130174, 397124963671, 882642816697, 1954708794400]

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

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