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.

A261378 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

Table of values

n a(n)
1 247
2 470
3 1714
4 5254
5 14312
6 42302
7 128998
8 377183
9 1099308
10 3261560
11 9647696
12 28358158
13 83587624
14 246835566
15 727709732
16 2144744412
17 6325797274
18 18656814748
19 55007382412
20 162201500248
21 478326263928
22 1410502041960
23 4159149074114

List of values

[247, 470, 1714, 5254, 14312, 42302, 128998, 377183, 1099308, 3261560, 9647696, 28358158, 83587624, 246835566, 727709732, 2144744412, 6325797274, 18656814748, 55007382412, 162201500248, 478326263928, 1410502041960, 4159149074114]

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

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