cp's OEIS Frontend

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.

A186211 Number of (n+1)X2 0..2 arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant.

Table of values

n a(n)
1 0
2 175
3 609
4 3593
5 15055
6 76263
7 353985
8 1729733
9 8225815
10 39664199
11 189800057
12 911926009
13 4372168391
14 20986330867
15 100672272185
16 483086490365
17 2317736112319
18 11120991460315
19 53358239027713
20 256018285828501

List of values

[0, 175, 609, 3593, 15055, 76263, 353985, 1729733, 8225815, 39664199, 189800057, 911926009, 4372168391, 20986330867, 100672272185, 483086490365, 2317736112319, 11120991460315, 53358239027713, 256018285828501]

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

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