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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.

A185561 1/4 the number of n X 3 0..3 arrays with no element equal both to the element above and to the element to its left.

Table of values

n a(n)
1 16
2 900
3 50580
4 2842560
5 159749820
6 8977824540
7 504547256880
8 28355191537860
9 1593541291098420
10 89555869973406240
11 5032975230384726780
12 282849573983126145660
13 15895941831670877597520
14 893340453575999346503940

List of values

[16, 900, 50580, 2842560, 159749820, 8977824540, 504547256880, 28355191537860, 1593541291098420, 89555869973406240, 5032975230384726780, 282849573983126145660, 15895941831670877597520, 893340453575999346503940]

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

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