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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.

A248586 a(n) = Sum_{i=0..n} C(n,i)*C(2i,i)^2.

Table of values

n a(n)
0 1
1 5
2 45
3 521
4 6733
5 92385
6 1316865
7 19274925
8 287694285
9 4359037985
10 66837293545
11 1034774126325
12 16149186405025
13 253737607849445
14 4009771017244485
15 63681603585696321
16 1015763347140335565
17 16264070907887454465

List of values

[1, 5, 45, 521, 6733, 92385, 1316865, 19274925, 287694285, 4359037985, 66837293545, 1034774126325, 16149186405025, 253737607849445, 4009771017244485, 63681603585696321, 1015763347140335565, 16264070907887454465]

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

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