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A177990 Triangle read by rows, variant of A070909, a cellular automaton 6
1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A070909 * A177990 = A177991

A007318 * A177990 = A177992

A177990 * A007318 = A177993

LINKS

Table of n, a(n) for n=1..55.

FORMULA

Infinite lower triangular matrix, variant of A070909: Columns alternate between (1,0,0,0,...) and (1,1,1,...); whereas A070909 leftmost column = (1,1,1,...).

EXAMPLE

First few rows of the triangle =

1;

0, 1;

0, 1, 1;

0, 1, 0, 1;

0, 1, 0, 1, 1;

0, 1, 0, 1, 0, 1;

0, 1, 0, 1, 0, 1, 1;

0, 1, 0, 1, 0, 1, 0, 1;

0, 1, 0, 1, 0, 1, 0, 1, 1;

0, 1, 0, 1, 0, 1, 0, 1, 0, 1;

0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1;

0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;

...

MATHEMATICA

rows = 10; ca = CellularAutomaton[28, {{1}, 0}, rows]; Table[ca[[k, 2 ;; k]], {k, 2, rows+1}] // Flatten (* Jean-François Alcover, Jul 12 2017 *)

CROSSREFS

Cf. A070909, A177991, A177992, A177993.

Sequence in context: A128430 A176330 A266246 * A287722 A284588 A113704

Adjacent sequences:  A177987 A177988 A177989 * A177991 A177992 A177993

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 16 2010

STATUS

approved

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Last modified March 18 13:47 EDT 2019. Contains 321289 sequences. (Running on oeis4.)