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.

A303620 Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 20
3 68
4 325
5 1870
6 10741
7 62207
8 363485
9 2135551
10 12586013
11 74323727
12 439462339
13 2600501501
14 15395919313
15 91177465195
16 540072985865
17 3199404347759
18 18954749501705
19 112301887289875
20 665378205627245
21 3942374534440139

List of values

[1, 20, 68, 325, 1870, 10741, 62207, 363485, 2135551, 12586013, 74323727, 439462339, 2600501501, 15395919313, 91177465195, 540072985865, 3199404347759, 18954749501705, 112301887289875, 665378205627245, 3942374534440139]

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

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