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.

A299591 Number of n X 4 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 5
2 5
3 11
4 23
5 53
6 121
7 250
8 533
9 1162
10 2490
11 5327
12 11465
13 24641
14 52882
15 113593
16 244046
17 524134
18 1125735
19 2418077
20 5193785
21 11155562
22 23961133
23 51466258
24 110544050
25 237437407
26 509992017
27 1095411137
28 2352832034
29 5053646321
30 10854722326

List of values

[5, 5, 11, 23, 53, 121, 250, 533, 1162, 2490, 5327, 11465, 24641, 52882, 113593, 244046, 524134, 1125735, 2418077, 5193785, 11155562, 23961133, 51466258, 110544050, 237437407, 509992017, 1095411137, 2352832034, 5053646321, 10854722326]

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

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