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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.

A371772 a(n) = Sum_{k=0..floor(n/3)} binomial(5*n-3*k-1,n-3*k).

Table of values

n a(n)
0 1
1 4
2 36
3 365
4 3892
5 42714
6 477621
7 5411109
8 61901268
9 713435333
10 8271470666
11 96361329024
12 1127086021461
13 13227336997645
14 155680966681101
15 1836862248992565
16 21719923705450260
17 257316706385394615
18 3053599633736172765
19 36292098436808314572
20 431918050456887676362

List of values

[1, 4, 36, 365, 3892, 42714, 477621, 5411109, 61901268, 713435333, 8271470666, 96361329024, 1127086021461, 13227336997645, 155680966681101, 1836862248992565, 21719923705450260, 257316706385394615, 3053599633736172765, 36292098436808314572, 431918050456887676362]

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

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