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A160126 Total number of squares and rectangles in the toothpick structure after n stages, divided by 2. (See A139250). 4
0, 0, 0, 1, 2, 2, 4, 9, 12, 12, 14, 18, 20, 22, 32, 47, 54, 54, 56, 60, 62, 64, 74, 88, 94, 96, 104, 114, 120, 134, 170, 209, 224, 224, 226, 230, 232, 234, 244, 258, 264, 266, 274, 284, 290, 304, 340, 378, 392, 394, 402, 412, 418, 432, 466, 500, 514 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..56.

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

FORMULA

a(n) = A160124(n)/2. - Nathaniel Johnston, Apr 12 2011

CROSSREFS

Cf. A139250, A159786, A159787, A159788, A159789, A160124, A160125, A160127.

Sequence in context: A019822 A281605 A199499 * A257515 A105152 A066346

Adjacent sequences:  A160123 A160124 A160125 * A160127 A160128 A160129

KEYWORD

nonn

AUTHOR

Omar E. Pol, May 03 2009

EXTENSIONS

Terms beyond a(10) from Nathaniel Johnston, Apr 12 2011

STATUS

approved

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Last modified February 19 20:48 EST 2018. Contains 299357 sequences. (Running on oeis4.)