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.

A240273 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 4
2 14
3 118
4 919
5 7562
6 64721
7 563496
8 4956889
9 43888821
10 390006208
11 3473152825
12 30971163817
13 276395100537
14 2467754655037
15 22039067141607
16 196858997624033
17 1758568575970935
18 15710437359317486
19 140356344121017589

List of values

[4, 14, 118, 919, 7562, 64721, 563496, 4956889, 43888821, 390006208, 3473152825, 30971163817, 276395100537, 2467754655037, 22039067141607, 196858997624033, 1758568575970935, 15710437359317486, 140356344121017589]

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

Content is available under The OEIS End-User License Agreement.