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.

A302671 Number of 5Xn 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 111
3 691
4 4267
5 42367
6 352174
7 3204956
8 28324200
9 248482982
10 2223806395
11 19612845211
12 174147277424
13 1545345042448
14 13690754212668
15 121518036637399
16 1077456338230779
17 9556752221812425
18 84773605649902772
19 751847387040101232

List of values

[0, 111, 691, 4267, 42367, 352174, 3204956, 28324200, 248482982, 2223806395, 19612845211, 174147277424, 1545345042448, 13690754212668, 121518036637399, 1077456338230779, 9556752221812425, 84773605649902772, 751847387040101232]

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

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