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.

A208859 Number of n X 3 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors.

Table of values

n a(n)
1 5
2 127
3 5796
4 273049
5 12883280
6 607924387
7 28686344276
8 1353633375649
9 63874412830520
10 3014066220322507
11 142225889552418956
12 6711267165754821049
13 316687117317930292160
14 14943635501046735026227
15 705151014286332805949636

List of values

[5, 127, 5796, 273049, 12883280, 607924387, 28686344276, 1353633375649, 63874412830520, 3014066220322507, 142225889552418956, 6711267165754821049, 316687117317930292160, 14943635501046735026227, 705151014286332805949636]

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

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