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.

A222909 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Table of values

n a(n)
1 15
2 75
3 767
4 7794
5 101398
6 1346067
7 21064292
8 356150811
9 6366063573
10 115668702638
11 2139261596454
12 39572902785373
13 737955955427551
14 13730713590038976
15 256798310856319397
16 4793531311138014167

List of values

[15, 75, 767, 7794, 101398, 1346067, 21064292, 356150811, 6366063573, 115668702638, 2139261596454, 39572902785373, 737955955427551, 13730713590038976, 256798310856319397, 4793531311138014167]

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

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