OFFSET
0,1
LINKS
Eric M. Schmidt, Table of n, a(n) for n = 0..1000
Eric M. Schmidt, C++ code to compute this sequence
Mirek Wojtowicz, Information on many 2D cellular automata
EXAMPLE
a(0) = 4 because the 2 X 2 square contains 4 cells. a(1) = 8 because 8 cells are neighbors of exactly 2 of the original 4 cells. a(2) = 12 because 12 cells are neighbors of exactly 2 of the previous 8 cells.
CROSSREFS
KEYWORD
nonn
AUTHOR
Oliver Pechenik, Sep 07 2004
EXTENSIONS
Offset changed by Eric M. Schmidt, Mar 10 2013
STATUS
approved