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.

A207900 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 42
2 1764
3 8928
4 47320
5 231900
6 1153532
7 5888458
8 29719004
9 148308700
10 747498440
11 3783114924
12 19018273952
13 95539877180
14 481930389188
15 2429549328924
16 12220600155324
17 61525298964898
18 310087031694592
19 1561597935502608

List of values

[42, 1764, 8928, 47320, 231900, 1153532, 5888458, 29719004, 148308700, 747498440, 3783114924, 19018273952, 95539877180, 481930389188, 2429549328924, 12220600155324, 61525298964898, 310087031694592, 1561597935502608]

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

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