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.

A249284 Number of length n+3 0..2 arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth.

Table of values

n a(n)
1 66
2 168
3 428
4 1094
5 2792
6 7132
7 18232
8 46616
9 119176
10 304696
11 779066
12 1992002
13 5093330
14 13023126
15 33299000
16 85142802
17 217703012
18 556648464
19 1423304428
20 3639273226
21 9305324178
22 23792953554
23 60836640416
24 155554327024
25 397739724496

List of values

[66, 168, 428, 1094, 2792, 7132, 18232, 46616, 119176, 304696, 779066, 1992002, 5093330, 13023126, 33299000, 85142802, 217703012, 556648464, 1423304428, 3639273226, 9305324178, 23792953554, 60836640416, 155554327024, 397739724496]

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

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