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.

A239821 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, modulo 4.

Table of values

n a(n)
1 11
2 113
3 1480
4 18728
5 232272
6 2912793
7 36627126
8 459870638
9 5774508494
10 72538478424
11 911227478673
12 11446501405086
13 143789611879946
14 1806288798172920
15 22690641341877163
16 285040443527806965

List of values

[11, 113, 1480, 18728, 232272, 2912793, 36627126, 459870638, 5774508494, 72538478424, 911227478673, 11446501405086, 143789611879946, 1806288798172920, 22690641341877163, 285040443527806965]

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

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