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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.

A171640 a(n) = 10*a(n-1)-a(n-2)-4 with a(1)=1 and a(2)=3.

Table of values

n a(n)
1 1
2 3
3 25
4 243
5 2401
6 23763
7 235225
8 2328483
9 23049601
10 228167523
11 2258625625
12 22358088723
13 221322261601
14 2190864527283
15 21687323011225
16 214682365584963
17 2125136332838401
18 21036680962799043
19 208241673295152025
20 2061380051988721203
21 20405558846592060001

List of values

[1, 3, 25, 243, 2401, 23763, 235225, 2328483, 23049601, 228167523, 2258625625, 22358088723, 221322261601, 2190864527283, 21687323011225, 214682365584963, 2125136332838401, 21036680962799043, 208241673295152025, 2061380051988721203, 20405558846592060001]

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

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