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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.

A140714 Triangle read by rows: T(n,k) is the number of white corners of rank k in all 321-avoiding permutations of {1,2,...,n} (n>=2, 0<=k<=n-2; for definitions see the Eriksson-Linusson references).

Table of values

n a(n)
2 1
3 3
4 1
5 9
6 5
7 2
8 28
9 19
10 12
11 5
12 90
13 68
14 51
15 33
16 14
17 297
18 240
19 197
20 150
21 98
22 42
23 1001
24 847
25 735
26 609
27 466
28 306
29 132

List of values

[1, 3, 1, 9, 5, 2, 28, 19, 12, 5, 90, 68, 51, 33, 14, 297, 240, 197, 150, 98, 42, 1001, 847, 735, 609, 466, 306, 132]

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

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