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.

A203178 Number of n X 5 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.

Table of values

n a(n)
1 3
2 6
3 41
4 205
5 952
6 4654
7 23083
8 115377
9 551208
10 2757161
11 13535075
12 66032042
13 327270427
14 1600093371
15 7879616025
16 38759698990
17 190148017740
18 936372926748
19 4597851371118
20 22603571928513
21 111146666196027
22 546043267710074

List of values

[3, 6, 41, 205, 952, 4654, 23083, 115377, 551208, 2757161, 13535075, 66032042, 327270427, 1600093371, 7879616025, 38759698990, 190148017740, 936372926748, 4597851371118, 22603571928513, 111146666196027, 546043267710074]

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

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