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.

A153365 Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2*n rows whose color is that of the top right corner.

Table of values

n a(n)
1 8
2 28
3 100
4 360
5 1300
6 4700
7 17000
8 61500
9 222500
10 805000
11 2912500
12 10537500
13 38125000
14 137937500
15 499062500
16 1805625000
17 6532812500
18 23635937500
19 85515625000
20 309398437500
21 1119414062500
22 4050078125000
23 14653320312500

List of values

[8, 28, 100, 360, 1300, 4700, 17000, 61500, 222500, 805000, 2912500, 10537500, 38125000, 137937500, 499062500, 1805625000, 6532812500, 23635937500, 85515625000, 309398437500, 1119414062500, 4050078125000, 14653320312500]

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

Content is available under The OEIS End-User License Agreement.