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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.

A223663 T(n,k) = Number of n X k 0..3 arrays with row sums unimodal and column sums inverted unimodal.

Table of values

n a(n)
1 4
2 16
3 16
4 50
5 256
6 50
7 130
8 3060
9 3060
10 130
11 296
12 29922
13 141046
14 29922
15 296
16 610
17 252912
18 5285887
19 5285887
20 252912
21 610
22 1163
23 1912914
24 169756788
25 761845474
26 169756788
27 1912914
28 1163
29 2083
30 13254601
31 4836834467
32 93974096640
33 93974096640

List of values

[4, 16, 16, 50, 256, 50, 130, 3060, 3060, 130, 296, 29922, 141046, 29922, 296, 610, 252912, 5285887, 5285887, 252912, 610, 1163, 1912914, 169756788, 761845474, 169756788, 1912914, 1163, 2083, 13254601, 4836834467, 93974096640, 93974096640]

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

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