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.

A266683 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.

Table of values

n a(n)
1 6
2 101
3 2520
4 77830
5 2643025
6 96489721
7 3689693411
8 146213224799
9 5947278854261
10 246989317561499
11 10427536481704470
12 446242967428521164
13 19312763398154267341
14 843835503392824253913
15 37171868113841641865335

List of values

[6, 101, 2520, 77830, 2643025, 96489721, 3689693411, 146213224799, 5947278854261, 246989317561499, 10427536481704470, 446242967428521164, 19312763398154267341, 843835503392824253913, 37171868113841641865335]

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

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