

A220525


Number of toothpicks or Dtoothpicks added at nth stage stage to the structure of A220524.


4



0, 1, 2, 4, 4, 4, 8, 11, 8, 4, 8, 16, 24, 16, 20, 25, 16, 4, 8, 16, 24, 32, 36, 42, 44, 20, 24, 44, 64, 40, 44, 53, 32, 4, 8, 16, 24, 32, 36, 44, 52, 42, 48, 64, 100, 80, 84, 91, 84, 28, 24, 48, 72, 92, 104, 124, 132, 54, 56, 100, 144, 88, 92, 109, 64, 4
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,3


COMMENTS

Essentially the first differences of A220524.
First differs from A194445 at a(13).


LINKS

Table of n, a(n) for n=0..65.
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences


FORMULA

a(n) = A221528(n)/4.


EXAMPLE

When written as an irregular triangle begins:
0;
1;
2;
4,4;
4,8,11,8;
4,8,16,24,16,20,25,16;
4,8,16,24,32,36,42,44,20,24,44,64,40,44,53,32;
4,8,16,24,32,36,44,52,42,48,64,100,80,84,91,84,28,24,48,72,92,104,124,132,54,56,100,144,88,92,109,64;


CROSSREFS

Row lengths give 1 together with A011782. Right border gives 0 together with A000079.
Cf. A139251, A194701, A194445, A220501, A220521, A220524, A220527.
Sequence in context: A231349 A170893 A194445 * A160809 A139251 A182635
Adjacent sequences: A220522 A220523 A220524 * A220526 A220527 A220528


KEYWORD

nonn,tabf


AUTHOR

Omar E. Pol, Mar 23 2013


STATUS

approved



