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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.

A386387 a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * Catalan(k).

Table of values

n a(n)
0 1
1 5
2 41
3 429
4 5073
5 64469
6 859385
7 11853949
8 167763361
9 2422342053
10 35543185353
11 528450589005
12 7943934373233
13 120537517728117
14 1843702988611737
15 28397640862311453
16 440070304667718465
17 6856488470912854853
18 107340528355762710377
19 1687682549936270584045

List of values

[1, 5, 41, 429, 5073, 64469, 859385, 11853949, 167763361, 2422342053, 35543185353, 528450589005, 7943934373233, 120537517728117, 1843702988611737, 28397640862311453, 440070304667718465, 6856488470912854853, 107340528355762710377, 1687682549936270584045]

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

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