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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.

A087783 Array T(n,k) (n >= 1, k >= 1) read by antidiagonals, giving number of ways of arranging the numbers 1 ... mn into an m X n array so there is exactly one local maximum.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 16
6 4
7 8
8 208
9 208
10 8
11 16
12 3584
13 29568
14 3584
15 16
16 32
17 76544
18 7452704
19 7452704
20 76544
21 32
22 64
23 1947648
24 2941306368
25 35704394880
26 2941306368
27 1947648
28 64
29 128
30 57477120
31 1683453629440
32 331333877743200
33 331333877743200
34 1683453629440
35 57477120
36 128
37 256
38 1929117696
39 1323082429842432
40 5338455334819710720
41 88366736882654697600
42 5338455334819710720
43 1323082429842432
44 1929117696
45 256
46 512
47 72545402880
48 1370418864769445888
49 137813651152462288749440

List of values

[1, 2, 2, 4, 16, 4, 8, 208, 208, 8, 16, 3584, 29568, 3584, 16, 32, 76544, 7452704, 7452704, 76544, 32, 64, 1947648, 2941306368, 35704394880, 2941306368, 1947648, 64, 128, 57477120, 1683453629440, 331333877743200, 331333877743200, 1683453629440, 57477120, 128, 256, 1929117696, 1323082429842432, 5338455334819710720, 88366736882654697600, 5338455334819710720, 1323082429842432, 1929117696, 256, 512, 72545402880, 1370418864769445888, 137813651152462288749440]

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

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