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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.

A344261 Number of n-step walks from one of the vertices with degree 3 to itself on the four-vertex diamond graph.

Table of values

n a(n)
0 1
1 0
2 3
3 4
4 15
5 32
6 91
7 220
8 583
9 1464
10 3795
11 9652
12 24831
13 63440
14 162763
15 416524
16 1067575
17 2733672
18 7003971
19 17938660
20 45954543
21 117709184
22 301527355
23 772364092
24 1978473511
25 5067929880
26 12981823923
27 33253543444
28 85180839135
29 218195012912
30 558918369451

List of values

[1, 0, 3, 4, 15, 32, 91, 220, 583, 1464, 3795, 9652, 24831, 63440, 162763, 416524, 1067575, 2733672, 7003971, 17938660, 45954543, 117709184, 301527355, 772364092, 1978473511, 5067929880, 12981823923, 33253543444, 85180839135, 218195012912, 558918369451]

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

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