A261695 First differences of A256534.

0, 4, 12, 12, 36, 12, 36, 60, 84, 12, 36, 60, 84, 108, 132, 156, 180, 12, 36, 60, 84, 108, 132, 156, 180, 204, 228, 252, 276, 300, 324, 348, 372, 12, 36, 60, 84, 108, 132, 156, 180, 204, 228, 252, 276, 300, 324, 348, 372, 396, 420, 444, 468, 492, 516, 540, 564, 588, 612, 636, 660, 684, 708, 732, 756, 12, 36, 60, 84, 108

Offset

0,2

Comments

Number of cells turned ON at n-th stage of cellular automaton of A256534.

Similar to A256531 which shares infinitely many terms.

Links

Table of n, a(n) for n=0..69.

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to cellular automata

Formula

It appears that a(n) = 4 * A241717(n-1), n >= 1.

Example

With the positive terms written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins:
4;
12;
12, 36;
12, 36, 60, 84;
12, 36, 60, 84, 108, 132, 156, 180;
12, 36, 60, 84, 108, 132, 156, 180, 204, 228, 252, 276, 300, 324, 348, 372;
...

Prog

(GW-BASIC)
10 'a261695 First 2^z-1 terms:
20 z=6: defdbl a: for i=1 to z: for j=0 to 2^(i-1)-1: n=n+1: a(n)=4^i + 3*(2*j)^2: print a(n)-a(n-1); : next j: next i: end

Crossrefs

Cf. A011782, A139251, A147582, A161411, A161415, A241717, A256531, A256534.

Sequence in context: A272942 A272923 A161411 * A380342 A209047 A209019

Adjacent sequences: A261692 A261693 A261694 * A261696 A261697 A261698

Keyword

nonn,tabf

Author

Omar E. Pol, Sep 24 2015

Status

approved