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.

A248430 Number of length n+2 0..5 arrays with every three consecutive terms having the sum of some two elements equal to twice the third.

Table of values

n a(n)
1 42
2 70
3 118
4 198
5 342
6 590
7 1014
8 1766
9 3062
10 5286
11 9222
12 16006
13 27654
14 48262
15 83782
16 144774
17 252678
18 438662
19 758022
20 1323014
21 2296838
22 3969030
23 6927366
24 12026374
25 20782086
26 36272134
27 62970886
28 108816390
29 189923334
30 329719814
31 569769990

List of values

[42, 70, 118, 198, 342, 590, 1014, 1766, 3062, 5286, 9222, 16006, 27654, 48262, 83782, 144774, 252678, 438662, 758022, 1323014, 2296838, 3969030, 6927366, 12026374, 20782086, 36272134, 62970886, 108816390, 189923334, 329719814, 569769990]

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

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