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.

A302279 Number of 2 X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 3
3 7
4 10
5 27
6 45
7 98
8 193
9 379
10 778
11 1523
12 3085
13 6138
14 12281
15 24603
16 49106
17 98363
18 196557
19 393234
20 786481
21 1572731
22 3145946
23 6291203
24 12583117
25 25165802
26 50331369
27 100663963
28 201325602
29 402654283
30 805305613
31 1610612610
32 3221227041

List of values

[0, 3, 7, 10, 27, 45, 98, 193, 379, 778, 1523, 3085, 6138, 12281, 24603, 49106, 98363, 196557, 393234, 786481, 1572731, 3145946, 6291203, 12583117, 25165802, 50331369, 100663963, 201325602, 402654283, 805305613, 1610612610, 3221227041]

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

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