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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.

A274985 a(n) = ([n]phi! - [n]{1-phi}!)/sqrt(5), where [n]_q! is the q-factorial, phi = (1+sqrt(5))/2.

Table of values

n a(n)
0 0
1 0
2 1
3 6
4 58
5 948
6 25992
7 1179016
8 87713040
9 10646068080
10 2101395344400
11 673242645670320
12 349671381118477440
13 294206779308703578240
14 400822226102433353285760
15 883965927408694948620295680
16 3155212287401150653204012531200

List of values

[0, 0, 1, 6, 58, 948, 25992, 1179016, 87713040, 10646068080, 2101395344400, 673242645670320, 349671381118477440, 294206779308703578240, 400822226102433353285760, 883965927408694948620295680, 3155212287401150653204012531200]

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

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