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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.

A002771 Number of terms in a skew determinant: a(n) = (A000085(n) + A081919(n))/2.

Table of values

n a(n)
1 1
2 2
3 4
4 13
5 41
6 226
7 1072
8 9374
9 60958
10 723916
11 5892536
12 86402812
13 837641884
14 14512333928
15 162925851376
16 3252104882056
17 41477207604872
18 937014810365584
19 13380460644770848
20 337457467862898896
21 5333575373478669136
22 148532521250931168352

List of values

[1, 2, 4, 13, 41, 226, 1072, 9374, 60958, 723916, 5892536, 86402812, 837641884, 14512333928, 162925851376, 3252104882056, 41477207604872, 937014810365584, 13380460644770848, 337457467862898896, 5333575373478669136, 148532521250931168352]

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

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