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.

A302880 Number of 5Xn 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 16
2 21
3 82
4 285
5 1197
6 7580
7 41498
8 224087
9 1300510
10 7961144
11 47528608
12 279333761
13 1677401880
14 10223444297
15 61648514855
16 368974094762
17 2225242688063
18 13491965168663
19 81443512904106
20 490081514479072
21 2957619899837635

List of values

[16, 21, 82, 285, 1197, 7580, 41498, 224087, 1300510, 7961144, 47528608, 279333761, 1677401880, 10223444297, 61648514855, 368974094762, 2225242688063, 13491965168663, 81443512904106, 490081514479072, 2957619899837635]

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

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