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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.

A371778 a(n) = Sum_{k=0..floor(n/3)} binomial(3*n+2,n-3*k).

Table of values

n a(n)
0 1
1 5
2 28
3 166
4 1015
5 6324
6 39901
7 254035
8 1628380
9 10493680
10 67914088
11 441086947
12 2873255906
13 18763759019
14 122803467241
15 805241108334
16 5288922607095
17 34789875710568
18 229147231044397
19 1511104857207706
20 9975701630282920
21 65920216186587257

List of values

[1, 5, 28, 166, 1015, 6324, 39901, 254035, 1628380, 10493680, 67914088, 441086947, 2873255906, 18763759019, 122803467241, 805241108334, 5288922607095, 34789875710568, 229147231044397, 1511104857207706, 9975701630282920, 65920216186587257]

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

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