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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.

A007767 Number of pairs of permutations of degree n that avoid (12,21).

Table of values

n a(n)
0 1
1 1
2 3
3 17
4 151
5 1899
6 31711
7 672697
8 17551323
9 549500451
10 20246665349
11 864261579999
12 42190730051687
13 2329965898878307
14 144220683681814515
15 9926440976428215117
16 754465679498026783923
17 62939664181821196179459
18 5732069150321309755351161
19 567176164248814234096702451

List of values

[1, 1, 3, 17, 151, 1899, 31711, 672697, 17551323, 549500451, 20246665349, 864261579999, 42190730051687, 2329965898878307, 144220683681814515, 9926440976428215117, 754465679498026783923, 62939664181821196179459, 5732069150321309755351161, 567176164248814234096702451]

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

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