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.

A223057 Number of n X 3 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 5
2 114
3 4865
4 213469
5 9383963
6 412602889
7 18142309235
8 797728639489
9 35076656042963
10 1542343995891289
11 67817897342466755
12 2981998328788355809
13 131120462107713937763
14 5765454466967090614489
15 253510891259359153159475

List of values

[5, 114, 4865, 213469, 9383963, 412602889, 18142309235, 797728639489, 35076656042963, 1542343995891289, 67817897342466755, 2981998328788355809, 131120462107713937763, 5765454466967090614489, 253510891259359153159475]

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

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