login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A220501 Number of toothpicks or D-toothpicks added at n-th stage in the structure of A220500. 16
0, 1, 4, 8, 16, 22, 24, 24, 36, 40, 32, 44, 64, 94, 72, 56, 76, 72, 32, 48, 80, 112, 140, 140, 140, 168, 120, 132, 168, 238, 168, 120, 156, 136, 32, 48, 80, 112, 140, 144, 164, 224, 216, 256, 272, 368, 324, 316, 280, 296, 160, 150, 232, 320, 404, 432, 408, 462, 300, 308, 376, 526, 360, 248, 316, 264, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Essentially the first differences of A220500.

LINKS

Table of n, a(n) for n=0..66.

David Applegate, The movie version

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

Index entries for sequences related to toothpick sequences

EXAMPLE

Written as an irregular triangle the sequence begins:

0;

1;

4;

8;

16,22;

24,24,36,40;

32,44,64,94,72,56,76,72;

32,48,80,112,140...

.

From Omar E. Pol, May 02 2018: (Start)

Also the nonzero terms can be written as an irregular triangle in which the row lengths are the terms of A011782 multiplied by 2 as shown below:

1,    4;

8,   16;

22,  24, 24, 36;

40,  32, 44, 64,  94,  72,  56,  76;

72,  32, 48, 80, 112, 140, 140, 140, 168, 120, 132, 168, 238, 168, 120, 156;

136, 32, 48, 80, 112, 140, 144, 164, 224, 216, 256, 272, 368, 324, 316, 280, ...

(End)

CROSSREFS

Cf. A047999, A139250, A139251, A194271, A194441, A194443, A194701, A220500, A220521, A220523, A220527.

Sequence in context: A312810 A194271 A194701 * A312811 A312812 A312813

Adjacent sequences:  A220498 A220499 A220500 * A220502 A220503 A220504

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Dec 15 2012

EXTENSIONS

Terms a(23) and beyond from David Applegate's movie version. - Omar E. Pol, May 02 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 22 16:31 EST 2019. Contains 329396 sequences. (Running on oeis4.)