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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.

A090728 a(n) = 20*a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 20.

Table of values

n a(n)
0 2
1 20
2 398
3 7940
4 158402
5 3160100
6 63043598
7 1257711860
8 25091193602
9 500566160180
10 9986232009998
11 199224074039780
12 3974495248785602
13 79290680901672260
14 1581839122784659598
15 31557491774791519700
16 629567996373045734402
17 12559802435686123168340

List of values

[2, 20, 398, 7940, 158402, 3160100, 63043598, 1257711860, 25091193602, 500566160180, 9986232009998, 199224074039780, 3974495248785602, 79290680901672260, 1581839122784659598, 31557491774791519700, 629567996373045734402, 12559802435686123168340]

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

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