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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.

A376085 a(0..5) = 1 and a(n) = 1 - a(n-1) - a(n-2) + a(n-1)*a(n-2)*a(n-3)/a(n-4) + a(n-2)*a(n-3)*a(n-4)/a(n-5) + a(n-3)*a(n-4)*a(n-5)/a(n-6), for n > 5.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 2
7 2
8 4
9 17
10 68
11 2312
12 668169
13 6179226912
14 140378107463180352
15 250687119058419133437352005889
16 325446213917387462112884613611747886778483963398144
17 1853431255195849256571682148793108515162996950284389365029788837512893363822697947303936

List of values

[1, 1, 1, 1, 1, 1, 2, 2, 4, 17, 68, 2312, 668169, 6179226912, 140378107463180352, 250687119058419133437352005889, 325446213917387462112884613611747886778483963398144, 1853431255195849256571682148793108515162996950284389365029788837512893363822697947303936]

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

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