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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.

A069448 Half the number of 3 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side.

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%I A069448 #9 Apr 07 2021 18:41:26
%S A069448 3,35,269,1723,10123,56757,309755,1663515,8846821,46767491,246319875,
%T A069448 1294402053,6792548971,35614277883,186632524741,977711862035,
%U A069448 5120933346419
%N A069448 Half the number of 3 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side.
%Y A069448 Cf. 2 X n A000225, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.
%K A069448 nonn
%O A069448 2,1
%A A069448 _R. H. Hardin_, Mar 22 2002

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

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