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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.

A360267 a(n) = Sum_{k=0..floor(n/4)} binomial(n-3*k,k) * binomial(2*(n-3*k),n-3*k).

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 72
5 264
6 984
7 3712
8 14136
9 54224
10 209200
11 810912
12 3155616
13 12320512
14 48239232
15 189336192
16 744722400
17 2934759360
18 11584470336
19 45796087680
20 181285742592
21 718498695424
22 2850802065152
23 11322567705600
24 45011437903104
25 179088911779328

List of values

[1, 2, 6, 20, 72, 264, 984, 3712, 14136, 54224, 209200, 810912, 3155616, 12320512, 48239232, 189336192, 744722400, 2934759360, 11584470336, 45796087680, 181285742592, 718498695424, 2850802065152, 11322567705600, 45011437903104, 179088911779328]

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

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