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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.

A166755 Number of n X n 1..2 arrays containing at least one of each value, and all equal values connected.

Table of values

n a(n)
1 0
2 12
3 106
4 1254
5 32426
6 2247486
7 443968782
8 255122769986
9 431534126902662
10 2165656440779563158
11 32418178732724142833570
12 1452876796004423753334759362
13 195482230310004930545348833858390
14 79131192890976439895988807925969458614
15 96533107106359142781127117074385161767893162

List of values

[0, 12, 106, 1254, 32426, 2247486, 443968782, 255122769986, 431534126902662, 2165656440779563158, 32418178732724142833570, 1452876796004423753334759362, 195482230310004930545348833858390, 79131192890976439895988807925969458614, 96533107106359142781127117074385161767893162]

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

Content is available under The OEIS End-User License Agreement.