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.

A295271 Number of n X 4 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1 or 4 1s.

Table of values

n a(n)
1 13
2 98
3 811
4 6659
5 54773
6 449827
7 3697742
8 30386185
9 249719021
10 2052217315
11 16865303569
12 138600705864
13 1139033988179
14 9360690397437
15 76927054505407
16 632193927094967
17 5195430458657358
18 42696546916624813
19 350884326612255131
20 2883601123790880675
21 23697711212919539231
22 194750068617952556626
23 1600474783664067960559
24 13152855612946330563815
25 108091431705620580695441

List of values

[13, 98, 811, 6659, 54773, 449827, 3697742, 30386185, 249719021, 2052217315, 16865303569, 138600705864, 1139033988179, 9360690397437, 76927054505407, 632193927094967, 5195430458657358, 42696546916624813, 350884326612255131, 2883601123790880675, 23697711212919539231, 194750068617952556626, 1600474783664067960559, 13152855612946330563815, 108091431705620580695441]

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

Content is available under The OEIS End-User License Agreement.