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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.

A147960 a(n) = ((9 + sqrt(2))^n + (9 - sqrt(2))^n)/2.

Table of values

n a(n)
0 1
1 9
2 83
3 783
4 7537
5 73809
6 733139
7 7365591
8 74662657
9 762046137
10 7818480563
11 80531005311
12 831898131121
13 8612216940609
14 89299952572403
15 927034007995143
16 9631915890692737
17 100138799400852969
18 1041577033850627219

List of values

[1, 9, 83, 783, 7537, 73809, 733139, 7365591, 74662657, 762046137, 7818480563, 80531005311, 831898131121, 8612216940609, 89299952572403, 927034007995143, 9631915890692737, 100138799400852969, 1041577033850627219]

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

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