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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.

A229406 Number of n X 2 0..3 arrays avoiding 11 horizontally, 22 vertically, 33 antidiagonally and 00 diagonally.

Table of values

n a(n)
1 15
2 163
3 1756
4 18712
5 199595
6 2127718
7 22684613
8 241841143
9 2578301479
10 27487534672
11 293047669224
12 3124213038091
13 33307577031714
14 355095715688893
15 3785714221110283
16 40359912854042611
17 430281439964832908

List of values

[15, 163, 1756, 18712, 199595, 2127718, 22684613, 241841143, 2578301479, 27487534672, 293047669224, 3124213038091, 33307577031714, 355095715688893, 3785714221110283, 40359912854042611, 430281439964832908]

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

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