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.

A069417 Number of 3 X n binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row.

Table of values

n a(n)
1 1
2 15
3 147
4 1231
5 9539
6 70679
7 509019
8 3596367
9 25070707
10 173088903
11 1186544331
12 8090866303
13 54950124515
14 372067098167
15 2513408596923
16 16948369098159
17 114128268554323
18 767705581586151
19 5159843165163435
20 34657637020377055
21 232672006452068291
22 1561421588852637335

List of values

[1, 15, 147, 1231, 9539, 70679, 509019, 3596367, 25070707, 173088903, 1186544331, 8090866303, 54950124515, 372067098167, 2513408596923, 16948369098159, 114128268554323, 767705581586151, 5159843165163435, 34657637020377055, 232672006452068291, 1561421588852637335]

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

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