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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.

A098772 a(n) = Sum_{k=0..n} binomial(2*n,2*k)^2.

Table of values

n a(n)
0 1
1 2
2 38
3 452
4 6470
5 92252
6 1352540
7 20056584
8 300546630
9 4537543340
10 68923356788
11 1052049129144
12 16123803193628
13 247959261273752
14 3824345320438520
15 59132290704871952
16 916312070771835462
17 14226520736453485260
18 221256270142955957252
19 3446310324328958045400
20 53753604366737011495220

List of values

[1, 2, 38, 452, 6470, 92252, 1352540, 20056584, 300546630, 4537543340, 68923356788, 1052049129144, 16123803193628, 247959261273752, 3824345320438520, 59132290704871952, 916312070771835462, 14226520736453485260, 221256270142955957252, 3446310324328958045400, 53753604366737011495220]

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

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