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.

A202883 Number of n X 2 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Table of values

n a(n)
1 3
2 35
3 265
4 1849
5 13345
6 96941
7 701275
8 5071167
9 36689027
10 265439091
11 1920308033
12 13892446697
13 100505282121
14 727107537885
15 5260271847715
16 38055531396239
17 275313438949691
18 1991760080088995
19 14409424470217081
20 104245243244589977

List of values

[3, 35, 265, 1849, 13345, 96941, 701275, 5071167, 36689027, 265439091, 1920308033, 13892446697, 100505282121, 727107537885, 5260271847715, 38055531396239, 275313438949691, 1991760080088995, 14409424470217081, 104245243244589977]

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

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