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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.

A225602 a(n) = A002426(n^2), where A002426 is the central trinomial coefficients.

Table of values

n a(n)
0 1
1 1
2 19
3 3139
4 5196627
5 82176836301
6 12159131877715993
7 16639279789182494873661
8 209099036316263774148543463251
9 24017537903429183163390175566336055657
10 25134265191388162956642519120384003897467908119
11 239089990313305548946878880624659134220897530949847409821

List of values

[1, 1, 19, 3139, 5196627, 82176836301, 12159131877715993, 16639279789182494873661, 209099036316263774148543463251, 24017537903429183163390175566336055657, 25134265191388162956642519120384003897467908119, 239089990313305548946878880624659134220897530949847409821]

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

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