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.

A229928 Number of nX2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 3
2 19
3 115
4 739
5 4679
6 29569
7 187211
8 1185283
9 7502685
10 47491531
11 300627179
12 1902998895
13 12046125511
14 76252939087
15 482687382245
16 3055450450511
17 19341249601691
18 122431683941789
19 775002524638781
20 4905829047952315

List of values

[3, 19, 115, 739, 4679, 29569, 187211, 1185283, 7502685, 47491531, 300627179, 1902998895, 12046125511, 76252939087, 482687382245, 3055450450511, 19341249601691, 122431683941789, 775002524638781, 4905829047952315]

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

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