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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.

A153369 Number of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is that of the top right corner.

Table of values

n a(n)
1 6
2 10
3 20
4 36
5 72
6 132
7 264
8 488
9 976
10 1812
11 3624
12 6744
13 13488
14 25132
15 50264
16 93720
17 187440
18 349620
19 699240
20 1304504
21 2609008
22 4867884
23 9735768
24 18166008
25 36332016
26 67794100
27 135588200
28 253006296
29 506012592
30 944222892
31 1888445784
32 3523868888

List of values

[6, 10, 20, 36, 72, 132, 264, 488, 976, 1812, 3624, 6744, 13488, 25132, 50264, 93720, 187440, 349620, 699240, 1304504, 2609008, 4867884, 9735768, 18166008, 36332016, 67794100, 135588200, 253006296, 506012592, 944222892, 1888445784, 3523868888]

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

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