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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.

A380493 a(n) = n! * Sum_{k=0..n} binomial(2*n+3,k)/(n-k)!.

Table of values

n a(n)
0 1
1 6
2 57
3 748
4 12585
5 259026
6 6315001
7 178134552
8 5711078673
9 205209960670
10 8171229107481
11 357235056697476
12 17014791129640057
13 877089297426429738
14 48657292133825026905
15 2890717184573264397616
16 183125115830192864360481
17 12323226433255671469949622

List of values

[1, 6, 57, 748, 12585, 259026, 6315001, 178134552, 5711078673, 205209960670, 8171229107481, 357235056697476, 17014791129640057, 877089297426429738, 48657292133825026905, 2890717184573264397616, 183125115830192864360481, 12323226433255671469949622]

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

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