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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.

A360317 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).

Table of values

n a(n)
0 1
1 2
2 10
3 52
4 278
5 1516
6 8388
7 46920
8 264678
9 1503052
10 8581676
11 49215256
12 283297660
13 1635904376
14 9472214344
15 54975423504
16 319729353606
17 1862896455180
18 10871759717916
19 63539265366264
20 371837338366740
21 2178604586281128
22 12778264475444280
23 75022726995053808

List of values

[1, 2, 10, 52, 278, 1516, 8388, 46920, 264678, 1503052, 8581676, 49215256, 283297660, 1635904376, 9472214344, 54975423504, 319729353606, 1862896455180, 10871759717916, 63539265366264, 371837338366740, 2178604586281128, 12778264475444280, 75022726995053808]

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

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