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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.

A378460 a(n) = Sum_{k=0..n} binomial(n+k-1,k) * binomial(2*n+k-1,n-k).

Table of values

n a(n)
0 1
1 2
2 14
3 107
4 854
5 6997
6 58337
7 492459
8 4195910
9 36008585
10 310797519
11 2695146412
12 23462692889
13 204927930573
14 1794924637121
15 15759722754487
16 138667548834150
17 1222405694908165
18 10793913082306739
19 95452822514557693
20 845239550997448559
21 7493699336086875984

List of values

[1, 2, 14, 107, 854, 6997, 58337, 492459, 4195910, 36008585, 310797519, 2695146412, 23462692889, 204927930573, 1794924637121, 15759722754487, 138667548834150, 1222405694908165, 10793913082306739, 95452822514557693, 845239550997448559, 7493699336086875984]

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

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