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.

A248465 Number of length 4+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.

Table of values

n a(n)
1 26
2 144
3 1436
4 6040
5 21182
6 56782
7 138534
8 295078
9 589916
10 1082878
11 1900666
12 3161064
13 5083368
14 7857546
15 11844802
16 17344202
17 24892396
18 34927864
19 48224830
20 65403924
21 87536430
22 115449764
23 150581308
24 194049230
25 247712034
26 312987618

List of values

[26, 144, 1436, 6040, 21182, 56782, 138534, 295078, 589916, 1082878, 1900666, 3161064, 5083368, 7857546, 11844802, 17344202, 24892396, 34927864, 48224830, 65403924, 87536430, 115449764, 150581308, 194049230, 247712034, 312987618]

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

Content is available under The OEIS End-User License Agreement.