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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.

A230671 Number of nX4 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 9
2 513
3 18915
4 730503
5 28368687
6 1100265795
7 42681522741
8 1655698076319
9 64227455495727
10 2491499259313149
11 96649752790452639
12 3749218360204902945
13 145438947787185663525
14 5641839307719342400131
15 218857130513207098732227

List of values

[9, 513, 18915, 730503, 28368687, 1100265795, 42681522741, 1655698076319, 64227455495727, 2491499259313149, 96649752790452639, 3749218360204902945, 145438947787185663525, 5641839307719342400131, 218857130513207098732227]

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

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