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.

A230063 Number of nX3 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 9
3 45
4 441
5 3645
6 31329
7 266805
8 2277081
9 19424205
10 165714129
11 1413721125
12 12060652041
13 102890947005
14 877775988609
15 7488419962005
16 63884675998521
17 545008403548845
18 4649536929125169
19 39665798745571845
20 338394040998364521

List of values

[0, 9, 45, 441, 3645, 31329, 266805, 2277081, 19424205, 165714129, 1413721125, 12060652041, 102890947005, 877775988609, 7488419962005, 63884675998521, 545008403548845, 4649536929125169, 39665798745571845, 338394040998364521]

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

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