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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.

A153373 Number of zig-zag paths from top to bottom of a rectangle of width 11 with 2n-1 rows whose color is not that of the top right corner.

Table of values

n a(n)
1 5
2 18
3 66
4 244
5 906
6 3372
7 12566
8 46860
9 174810
10 652252
11 2433942
12 9083004
13 33897050
14 126503148
15 472111446
16 1761934444
17 6575609946
18 24540472572
19 91586214806
20 341804255580
21 1275630545370
22 4760717401612
23 17767238012502

List of values

[5, 18, 66, 244, 906, 3372, 12566, 46860, 174810, 652252, 2433942, 9083004, 33897050, 126503148, 472111446, 1761934444, 6575609946, 24540472572, 91586214806, 341804255580, 1275630545370, 4760717401612, 17767238012502]

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

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