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.

A185406 1/7 the number of nX3 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 1
2 150
3 5040
4 279918
5 12205368
6 595974240
7 27536905674
8 1306753756812
9 61210525548816
10 2885367241303254
11 135594323017300224
12 6381618680273394960
13 300126625465471449282
14 14119903429577075460420
15 664177642891735878467280

List of values

[1, 150, 5040, 279918, 12205368, 595974240, 27536905674, 1306753756812, 61210525548816, 2885367241303254, 135594323017300224, 6381618680273394960, 300126625465471449282, 14119903429577075460420, 664177642891735878467280]

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

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