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.

A259244 Number of (n+1) X (2+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0011 or 0111.

Table of values

n a(n)
1 21
2 65
3 192
4 581
5 1733
6 5216
7 15613
8 46897
9 140568
10 421901
11 1265269
12 3796472
13 11387877
14 34165857
15 102492080
16 307483605
17 922431077
18 2767317200
19 8301880013
20 24905716177
21 74716886152
22 224150891421
23 672451700885
24 2017355772136

List of values

[21, 65, 192, 581, 1733, 5216, 15613, 46897, 140568, 421901, 1265269, 3796472, 11387877, 34165857, 102492080, 307483605, 922431077, 2767317200, 8301880013, 24905716177, 74716886152, 224150891421, 672451700885, 2017355772136]

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

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