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.

A259245 Number of (n+1) X (3+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0011 or 0111.

Table of values

n a(n)
1 48
2 192
3 720
4 2816
5 10720
6 41552
7 159168
8 614560
9 2360464
10 9098240
11 34986848
12 134750672
13 518448960
14 1996103456
15 7681731600
16 29571245952
17 113812664288
18 438098128720
19 1686212575424
20 6490526009760
21 24982143580048
22 96159317085952

List of values

[48, 192, 720, 2816, 10720, 41552, 159168, 614560, 2360464, 9098240, 34986848, 134750672, 518448960, 1996103456, 7681731600, 29571245952, 113812664288, 438098128720, 1686212575424, 6490526009760, 24982143580048, 96159317085952]

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

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