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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.

A168595 a(n) = Sum_{k=0..2n} C(2n,k)*A027907(n,k) where A027907 is the triangle of trinomial coefficients.

Table of values

n a(n)
0 1
1 4
2 36
3 358
4 3748
5 40404
6 443886
7 4941654
8 55555236
9 629285416
10 7170731236
11 82108083204
12 943960439086
13 10889085499348
14 125974782200478
15 1461030555025458
16 16981658850393252
17 197757344280343968

List of values

[1, 4, 36, 358, 3748, 40404, 443886, 4941654, 55555236, 629285416, 7170731236, 82108083204, 943960439086, 10889085499348, 125974782200478, 1461030555025458, 16981658850393252, 197757344280343968]

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

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