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.

A301994 Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 2
3 5
4 15
5 48
6 155
7 499
8 1602
9 5137
10 16467
11 52784
12 169199
13 542375
14 1738618
15 5573261
16 17865479
17 57269040
18 183579891
19 588478091
20 1886407378
21 6047009817
22 19384109803
23 62137109808
24 199184819687
25 638500768991
26 2046758546378
27 6561026627701

List of values

[1, 2, 5, 15, 48, 155, 499, 1602, 5137, 16467, 52784, 169199, 542375, 1738618, 5573261, 17865479, 57269040, 183579891, 588478091, 1886407378, 6047009817, 19384109803, 62137109808, 199184819687, 638500768991, 2046758546378, 6561026627701]

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

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