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.

A205818 Number of (n+1) X 4 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.

Table of values

n a(n)
1 180
2 714
3 2880
4 12318
5 53100
6 230532
7 1002240
8 4361064
9 18980472
10 82617132
11 359622708
12 1565418528
13 6814215036
14 29662110636
15 129118523304
16 562050276348
17 2446593518052
18 10649972628456
19 46359118343628
20 201800318106108

List of values

[180, 714, 2880, 12318, 53100, 230532, 1002240, 4361064, 18980472, 82617132, 359622708, 1565418528, 6814215036, 29662110636, 129118523304, 562050276348, 2446593518052, 10649972628456, 46359118343628, 201800318106108]

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

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