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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.

A239967 a(n) = a(n-1)*a(n-2) - a(n-3)*a(n-4), starting with 1,1,2,2.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 3
6 4
7 8
8 26
9 196
10 5064
11 992336
12 5025184408
13 4986671393704544
14 25058943335463698842360448
15 124960715887419957580506993886784668778624
16 3131383498581835095655557937198087383978439131276209799741457913600

List of values

[1, 1, 2, 2, 3, 4, 8, 26, 196, 5064, 992336, 5025184408, 4986671393704544, 25058943335463698842360448, 124960715887419957580506993886784668778624, 3131383498581835095655557937198087383978439131276209799741457913600]

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

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