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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.

A290575 Apéry-like numbers Sum_{k=0..n} (C(n,k) * C(2*k,n))^2.

Table of values

n a(n)
0 1
1 4
2 40
3 544
4 8536
5 145504
6 2618176
7 48943360
8 941244376
9 18502137184
10 370091343040
11 7508629231360
12 154145664817600
13 3196100636757760
14 66834662101834240
15 1407913577733228544
16 29849617614785770456
17 636440695668355742560
18 13638210075999240396736
19 293565508750164008207104
20 6344596821114216520841536

List of values

[1, 4, 40, 544, 8536, 145504, 2618176, 48943360, 941244376, 18502137184, 370091343040, 7508629231360, 154145664817600, 3196100636757760, 66834662101834240, 1407913577733228544, 29849617614785770456, 636440695668355742560, 13638210075999240396736, 293565508750164008207104, 6344596821114216520841536]

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

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