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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.

A377149 a(n) = Sum_{k=0..floor(n/2)} binomial(k+3,3) * binomial(k,n-2*k)^2.

Table of values

n a(n)
0 1
1 0
2 4
3 4
4 10
5 40
6 30
7 180
8 215
9 580
10 1316
11 1960
12 5719
13 8624
14 20420
15 39536
16 71985
17 160584
18 276664
19 588180
20 1099786
21 2098480
22 4201594
23 7665724
24 15266640
25 28422684
26 54252560
27 103928876
28 193166861
29 371012360
30 690296162
31 1304353740
32 2450895828
33 4565652908

List of values

[1, 0, 4, 4, 10, 40, 30, 180, 215, 580, 1316, 1960, 5719, 8624, 20420, 39536, 71985, 160584, 276664, 588180, 1099786, 2098480, 4201594, 7665724, 15266640, 28422684, 54252560, 103928876, 193166861, 371012360, 690296162, 1304353740, 2450895828, 4565652908]

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

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