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.

A069442 Half the number of n X 4 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.

Table of values

n a(n)
1 0
2 8
3 440
4 13002
5 291782
6 5718464
7 103948054
8 1806753034
9 30539121806
10 507006229578
11 8318320069722
12 135401306105052
13 2192221953687972
14 35363748022460400
15 569037825802441810
16 9140526218802015968
17 146649357444276412850
18 2350864549078452042124

List of values

[0, 8, 440, 13002, 291782, 5718464, 103948054, 1806753034, 30539121806, 507006229578, 8318320069722, 135401306105052, 2192221953687972, 35363748022460400, 569037825802441810, 9140526218802015968, 146649357444276412850, 2350864549078452042124]

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

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