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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.

A346648 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(6*k,k) / (5*k + 1).

Table of values

n a(n)
0 1
1 2
2 9
3 73
4 751
5 8587
6 104425
7 1323952
8 17303503
9 231455104
10 3153167249
11 43597546197
12 610232050453
13 8629733401556
14 123114479858631
15 1769728635257503
16 25607523627970183
17 372688563309335806
18 5451995469296025115
19 80122698147986922194
20 1182341393088427774071

List of values

[1, 2, 9, 73, 751, 8587, 104425, 1323952, 17303503, 231455104, 3153167249, 43597546197, 610232050453, 8629733401556, 123114479858631, 1769728635257503, 25607523627970183, 372688563309335806, 5451995469296025115, 80122698147986922194, 1182341393088427774071]

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

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