cp's OEIS Frontend

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.

A059486 3-enumeration of 2n+1 X 2n+1 vertically symmetric alternating-sign matrices.

Table of values

n a(n)
0 1
1 1
2 5
3 126
4 16038
5 10320453
6 33590259846
7 553104735325740
8 46084184498427053436
9 19430969437346561065941390
10 41463730793298298041665385308325
11 447814224393522724673729884056814834500
12 24479424309393636290695101063892553945412075000

List of values

[1, 1, 5, 126, 16038, 10320453, 33590259846, 553104735325740, 46084184498427053436, 19430969437346561065941390, 41463730793298298041665385308325, 447814224393522724673729884056814834500, 24479424309393636290695101063892553945412075000]

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

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