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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.

A346935 a(n) = Sum_{d|n} mu(n/d) * binomial(4*d,d) / (3*d+1).

Table of values

n a(n)
1 1
2 3
3 21
4 136
5 968
6 7059
7 53819
8 420592
9 3362238
10 27342916
11 225568797
12 1882926144
13 15875338989
14 134993712777
15 1156393242330
16 9969937070688
17 86445222719723
18 753310719641286
19 6594154339031799
20 57956002304003096
21 511238042454487704
22 4524678117713613419
23 40166643855158315819

List of values

[1, 3, 21, 136, 968, 7059, 53819, 420592, 3362238, 27342916, 225568797, 1882926144, 15875338989, 134993712777, 1156393242330, 9969937070688, 86445222719723, 753310719641286, 6594154339031799, 57956002304003096, 511238042454487704, 4524678117713613419, 40166643855158315819]

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

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