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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.

A375314 a(n) = Sum_{k=0..floor(n/2)} binomial(4*k,n-2*k).

Table of values

n a(n)
0 1
1 0
2 1
3 4
4 7
5 12
6 30
7 68
8 137
9 292
10 644
11 1380
12 2936
13 6324
14 13625
15 29216
16 62701
17 134784
18 289547
19 621708
20 1335378
21 2868620
22 6161329
23 13233352
24 28424456
25 61053608
26 131135696
27 281665480
28 604991601
29 1299461088
30 2791106585
31 5995016764
32 12876698159
33 27657841516

List of values

[1, 0, 1, 4, 7, 12, 30, 68, 137, 292, 644, 1380, 2936, 6324, 13625, 29216, 62701, 134784, 289547, 621708, 1335378, 2868620, 6161329, 13233352, 28424456, 61053608, 131135696, 281665480, 604991601, 1299461088, 2791106585, 5995016764, 12876698159, 27657841516]

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

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