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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.

A069404 Half the number of n X 4 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.

Table of values

n a(n)
1 7
2 55
3 377
4 2427
5 15253
6 94847
7 587031
8 3625675
9 22372413
10 137993145
11 850987067
12 5247512077
13 32357022035
14 199515609775
15 1230218484787
16 7585536760417
17 46772417567873
18 288398549126971
19 1778263916566525
20 10964764644841043
21 67608669872179151
22 416874624972396255

List of values

[7, 55, 377, 2427, 15253, 94847, 587031, 3625675, 22372413, 137993145, 850987067, 5247512077, 32357022035, 199515609775, 1230218484787, 7585536760417, 46772417567873, 288398549126971, 1778263916566525, 10964764644841043, 67608669872179151, 416874624972396255]

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

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