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.

A269146 Number of n X 2 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 4
2 80
3 768
4 6224
5 46464
6 330192
7 2270592
8 15251152
9 100647168
10 655139152
11 4217820672
12 26911075152
13 170416738944
14 1072338720464
15 6710943646848
16 41800542176720
17 259288295447040
18 1602497927690832
19 9871915467776256

List of values

[4, 80, 768, 6224, 46464, 330192, 2270592, 15251152, 100647168, 655139152, 4217820672, 26911075152, 170416738944, 1072338720464, 6710943646848, 41800542176720, 259288295447040, 1602497927690832, 9871915467776256]

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

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