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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.

A262267 Number of (n+2) X (1+2) 0..1 arrays with each row and column divisible by 5, read as a binary number with top and left being the most significant bits.

Table of values

n a(n)
1 2
2 4
3 7
4 13
5 26
6 52
7 103
8 205
9 410
10 820
11 1639
12 3277
13 6554
14 13108
15 26215
16 52429
17 104858
18 209716
19 419431
20 838861
21 1677722
22 3355444
23 6710887
24 13421773
25 26843546
26 53687092
27 107374183
28 214748365
29 429496730
30 858993460
31 1717986919
32 3435973837

List of values

[2, 4, 7, 13, 26, 52, 103, 205, 410, 820, 1639, 3277, 6554, 13108, 26215, 52429, 104858, 209716, 419431, 838861, 1677722, 3355444, 6710887, 13421773, 26843546, 53687092, 107374183, 214748365, 429496730, 858993460, 1717986919, 3435973837]

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

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