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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.

A345367 a(n) = Sum_{k=0..n} binomial(4*k,k) / (3*k + 1).

Table of values

n a(n)
0 1
1 2
2 6
3 28
4 168
5 1137
6 8221
7 62041
8 482773
9 3845033
10 31188921
11 256757719
12 2139691083
13 18015030073
14 153008796673
15 1309402039993
16 11279339531413
17 97724562251137
18 851035285261745
19 7445189624293545
20 65401191955640665
21 576639234410182210
22 5101317352349364430

List of values

[1, 2, 6, 28, 168, 1137, 8221, 62041, 482773, 3845033, 31188921, 256757719, 2139691083, 18015030073, 153008796673, 1309402039993, 11279339531413, 97724562251137, 851035285261745, 7445189624293545, 65401191955640665, 576639234410182210, 5101317352349364430]

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

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