A220525 Number of toothpicks or D-toothpicks added at n-th stage to the structure of A220524.

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

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 A342272

Adjacent sequences: A220522 A220523 A220524 * A220526 A220527 A220528

Keyword

nonn,tabf

Author

Omar E. Pol, Mar 23 2013

Status

approved