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.

A203180 Number of nX7 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 5
2 18
3 235
4 2466
5 23083
6 223567
7 2208945
8 22411843
9 216858412
10 2141041521
11 21294389765
12 209517628754
13 2070288232686
14 20420464639642
15 201913230471755
16 1993188902599209
17 19665745111235770
18 194376407794905718

List of values

[5, 18, 235, 2466, 23083, 223567, 2208945, 22411843, 216858412, 2141041521, 21294389765, 209517628754, 2070288232686, 20420464639642, 201913230471755, 1993188902599209, 19665745111235770, 194376407794905718]

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

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