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.

A153371 Number of zig-zag paths from top to bottom of a rectangle of width 11 with 2n rows whose color is that of the top right corner.

Table of values

n a(n)
1 10
2 36
3 132
4 488
5 1812
6 6744
7 25132
8 93720
9 349620
10 1304504
11 4867884
12 18166008
13 67794100
14 253006296
15 944222892
16 3523868888
17 13151219892
18 49080945144
19 183172429612
20 683608511160
21 2551261090740
22 9521434803224
23 35534476025004

List of values

[10, 36, 132, 488, 1812, 6744, 25132, 93720, 349620, 1304504, 4867884, 18166008, 67794100, 253006296, 944222892, 3523868888, 13151219892, 49080945144, 183172429612, 683608511160, 2551261090740, 9521434803224, 35534476025004]

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

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