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.

A251148 Number of (n+1) X (7+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Table of values

n a(n)
1 853
2 1075
3 1413
4 1987
5 2925
6 4491
7 7101
8 11491
9 18917
10 31587
11 53389
12 91275
13 157789
14 275843
15 487717
16 872259
17 1577901
18 2886539
19 5337725
20 9971363
21 18803813
22 35765155
23 68549453
24 132276107
25 256749085
26 500872771
27 981317541
28 1929582211
29 3805684077

List of values

[853, 1075, 1413, 1987, 2925, 4491, 7101, 11491, 18917, 31587, 53389, 91275, 157789, 275843, 487717, 872259, 1577901, 2886539, 5337725, 9971363, 18803813, 35765155, 68549453, 132276107, 256749085, 500872771, 981317541, 1929582211, 3805684077]

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

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