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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.

A320468 a(n) = a(n-1) + 20*a(n-2), n >= 2; a(0)=1, a(1)=41.

Table of values

n a(n)
0 1
1 41
2 61
3 881
4 2101
5 19721
6 61741
7 456161
8 1690981
9 10814201
10 44633821
11 260917841
12 1153594261
13 6371951081
14 29443836301
15 156882857921
16 745759583941
17 3883416742361
18 18798608421181
19 96466943268401
20 472439111692021
21 2401777977060041
22 11850560210900461
23 59886119752101281
24 296897323970110501

List of values

[1, 41, 61, 881, 2101, 19721, 61741, 456161, 1690981, 10814201, 44633821, 260917841, 1153594261, 6371951081, 29443836301, 156882857921, 745759583941, 3883416742361, 18798608421181, 96466943268401, 472439111692021, 2401777977060041, 11850560210900461, 59886119752101281, 296897323970110501]

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

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