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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.

A346925 a(n) = Sum_{d|n} mu(n/d) * binomial(3*d,d) / (2*d+1).

Table of values

n a(n)
1 1
2 2
3 11
4 52
5 272
6 1414
7 7751
8 43208
9 246663
10 1430440
11 8414639
12 50065628
13 300830571
14 1822758766
15 11124755380
16 68328711696
17 422030545334
18 2619630794574
19 16332922290299
20 102240108466928
21 642312451209982
22 4048514835624478
23 25594403741131679
24 162250237951706584

List of values

[1, 2, 11, 52, 272, 1414, 7751, 43208, 246663, 1430440, 8414639, 50065628, 300830571, 1822758766, 11124755380, 68328711696, 422030545334, 2619630794574, 16332922290299, 102240108466928, 642312451209982, 4048514835624478, 25594403741131679, 162250237951706584]

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

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