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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.

A360310 a(n) = Sum_{k=0..floor(n/4)} binomial(n-1-3*k,n-4*k) * binomial(2*k,k).

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 2
5 2
6 2
7 2
8 8
9 14
10 20
11 26
12 52
13 98
14 164
15 250
16 426
17 762
18 1328
19 2194
20 3682
21 6366
22 11072
23 18878
24 32038
25 54906
26 94860
27 163226
28 279634
29 479806
30 826776
31 1425542
32 2454020
33 4223170
34 7279164
35 12560466
36 21671314
37 37381714
38 64512676
39 111414042

List of values

[1, 0, 0, 0, 2, 2, 2, 2, 8, 14, 20, 26, 52, 98, 164, 250, 426, 762, 1328, 2194, 3682, 6366, 11072, 18878, 32038, 54906, 94860, 163226, 279634, 479806, 826776, 1425542, 2454020, 4223170, 7279164, 12560466, 21671314, 37381714, 64512676, 111414042]

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

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