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A151779 a(1)=1; for n > 1, a(n)=6*5^{wt(n-1)-1}. 11
1, 6, 6, 30, 6, 30, 30, 150, 6, 30, 30, 150, 30, 150, 150, 750, 6, 30, 30, 150, 30, 150, 150, 750, 30, 150, 150, 750, 150, 750, 750, 3750, 6, 30, 30, 150, 30, 150, 150, 750, 30, 150, 150, 750, 150, 750, 750, 3750, 30, 150, 150, 750, 150, 750, 750, 3750, 150, 750, 750, 3750 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of cells turned ON in n-th generation of cellular automaton based on Z^3 lattice in the same way that A147562 is based on the Z^2 lattice. Here each cell has six neighbors.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata

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

MAPLE

wt := proc(n) local w, m, i; w := 0; m := n; while m > 0 do i := m mod 2; w := w+i; m := (m-i)/2; od; w; end:

f:=d->[seq((2*d)*(2*d-1)^(wt(n-1)-1), n=2..120)];

f2:=d->[1, op(f(d))];

f2(3);

PROG

(PARI) a(n)=6*5^(hammingweight(n-1)-1)\1 \\ Charles R Greathouse IV, Mar 07 2015

CROSSREFS

Cf. A147582, A151780, A151781, A151782.

Sequence in context: A253066 A016725 A267651 * A255462 A066714 A054436

Adjacent sequences:  A151776 A151777 A151778 * A151780 A151781 A151782

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jun 25 2009

STATUS

approved

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Last modified October 18 11:56 EDT 2018. Contains 316321 sequences. (Running on oeis4.)