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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.

A345368 a(n) = Sum_{k=0..n} binomial(5*k,k) / (4*k + 1).

Table of values

n a(n)
0 1
1 2
2 7
3 42
4 327
5 2857
6 26608
7 258488
8 2588933
9 26539288
10 277082658
11 2936050788
12 31494394563
13 341325970323
14 3731742758203
15 41108999917483
16 455850863463768
17 5084213586320193
18 56997201842602368
19 641906808539396253
20 7258985455500009623
21 82393287049581399283

List of values

[1, 2, 7, 42, 327, 2857, 26608, 258488, 2588933, 26539288, 277082658, 2936050788, 31494394563, 341325970323, 3731742758203, 41108999917483, 455850863463768, 5084213586320193, 56997201842602368, 641906808539396253, 7258985455500009623, 82393287049581399283]

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

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