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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.

A259420 Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111.

Table of values

n a(n)
1 13
2 243
3 12953
4 1990133
5 873754597
6 1101527291223
7 3975872829274865
8 41147590225188806309
9 1220087829652769318601383
10 103689338398592714772850061461
11 25251868912730969096083539641411367

List of values

[13, 243, 12953, 1990133, 873754597, 1101527291223, 3975872829274865, 41147590225188806309, 1220087829652769318601383, 103689338398592714772850061461, 25251868912730969096083539641411367]

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

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