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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.

A288470 a(n) = Sum_{k=0..n} binomial(n,k)*binomial(2*n,2*k).

Table of values

n a(n)
0 1
1 2
2 14
3 92
4 646
5 4652
6 34124
7 253528
8 1901638
9 14368844
10 109208164
11 833981128
12 6394017436
13 49185717752
14 379438594136
15 2934361958192
16 22741538394694
17 176582855512588
18 1373431963785332
19 10698376362421096
20 83447762846703796
21 651690159076273192
22 5095051571420324264
23 39874449115469939152
24 312350761370734541596

List of values

[1, 2, 14, 92, 646, 4652, 34124, 253528, 1901638, 14368844, 109208164, 833981128, 6394017436, 49185717752, 379438594136, 2934361958192, 22741538394694, 176582855512588, 1373431963785332, 10698376362421096, 83447762846703796, 651690159076273192, 5095051571420324264, 39874449115469939152, 312350761370734541596]

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

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