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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.

A373904 a(n) = Sum_{k=0..floor(n/2)} binomial(n+4*k,n-2*k).

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 30
5 98
6 303
7 937
8 2936
9 9260
10 29209
11 91999
12 289547
13 911255
14 2868341
15 9029425
16 28424456
17 89478064
18 281667368
19 886657848
20 2791106585
21 8786123349
22 27657838272
23 87064092870
24 274068969337
25 862741412709
26 2715822822365
27 8549136056237
28 26911817257385

List of values

[1, 1, 2, 8, 30, 98, 303, 937, 2936, 9260, 29209, 91999, 289547, 911255, 2868341, 9029425, 28424456, 89478064, 281667368, 886657848, 2791106585, 8786123349, 27657838272, 87064092870, 274068969337, 862741412709, 2715822822365, 8549136056237, 26911817257385]

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

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