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.

A203095 Number of n X 2 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Table of values

n a(n)
1 4
2 84
3 1080
4 12260
5 143510
6 1705124
7 20174774
8 238288768
9 2816078514
10 33286887866
11 393430889634
12 4650009454296
13 54959608405434
14 649582808767618
15 7677588567818968
16 90743395882037312
17 1072519744806185004

List of values

[4, 84, 1080, 12260, 143510, 1705124, 20174774, 238288768, 2816078514, 33286887866, 393430889634, 4650009454296, 54959608405434, 649582808767618, 7677588567818968, 90743395882037312, 1072519744806185004]

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

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