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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.

A126596 a(n) = binomial(4*n,n)*(2*n+1)/(3*n+1).

Table of values

n a(n)
0 1
1 3
2 20
3 154
4 1260
5 10659
6 92092
7 807300
8 7152444
9 63882940
10 574221648
11 5188082354
12 47073334100
13 428634152730
14 3914819231400
15 35848190542920
16 329007937216860
17 3025582795190340
18 27872496751392496
19 257172019222240200
20 2376196095585231920
21 21983235825545286435

List of values

[1, 3, 20, 154, 1260, 10659, 92092, 807300, 7152444, 63882940, 574221648, 5188082354, 47073334100, 428634152730, 3914819231400, 35848190542920, 329007937216860, 3025582795190340, 27872496751392496, 257172019222240200, 2376196095585231920, 21983235825545286435]

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

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