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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.

A277969 a(n) = Sum_{k=0..n} binomial(n-3,n-k)*Catalan(k).

Table of values

n a(n)
0 1
1 -1
2 2
3 5
4 19
5 75
6 305
7 1270
8 5390
9 23236
10 101480
11 448085
12 1997115
13 8973255
14 40602093
15 184853055
16 846206025
17 3892585325
18 17984308775
19 83417287855
20 388297304825
21 1813341109825
22 8493372326675
23 39889629750600
24 187812852106636

List of values

[1, -1, 2, 5, 19, 75, 305, 1270, 5390, 23236, 101480, 448085, 1997115, 8973255, 40602093, 184853055, 846206025, 3892585325, 17984308775, 83417287855, 388297304825, 1813341109825, 8493372326675, 39889629750600, 187812852106636]

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

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