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.

A251146 Number of (n+1) X (5+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)
1 213
2 299
3 433
4 667
5 1061
6 1743
7 2925
8 5003
9 8689
10 15307
11 27317
12 49359
13 90237
14 166811
15 311569
16 587515
17 1117445
18 2141775
19 4132941
20 8022251
21 15650353
22 30663019
23 60294293
24 118919247
25 235137501
26 465904763
27 924738385
28 1838035483
29 3657558629

List of values

[213, 299, 433, 667, 1061, 1743, 2925, 5003, 8689, 15307, 27317, 49359, 90237, 166811, 311569, 587515, 1117445, 2141775, 4132941, 8022251, 15650353, 30663019, 60294293, 118919247, 235137501, 465904763, 924738385, 1838035483, 3657558629]

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

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