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A170926 Total number of squares and rectangles at the n-th stage in the corner toothpick structure (see A152890, A153006). 3
0, 0, 1, 3, 4, 5, 10, 17, 20, 21, 25, 30, 33, 40, 58, 77, 84, 85, 89, 94, 97, 104, 121, 138, 145, 151, 164, 177, 190, 222, 278, 325, 340, 341, 345, 350, 353, 360, 377, 394, 401, 407, 420, 433, 446, 478, 533, 578, 593, 599, 612, 625, 638, 669, 720, 761, 781, 806, 845, 884, 942 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..60.

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(2^k) = (4^k-4)/3 for k >= 2. - N. J. A. Sloane, Feb 13 2010.

CROSSREFS

Partial sums of A168131.

Sequence in context: A176848 A058615 A082612 * A122413 A297661 A136366

Adjacent sequences:  A170923 A170924 A170925 * A170927 A170928 A170929

KEYWORD

nonn

AUTHOR

Omar E. Pol. Jan 18 2010.

EXTENSIONS

Edited and extended by N. J. A. Sloane, Feb 01 2010

STATUS

approved

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Last modified February 22 13:55 EST 2018. Contains 299454 sequences. (Running on oeis4.)