A194811 - OEIS

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A194811

Number of grid points that are covered after n-th stage of A139250 version "Tree", starting with a(0) = 1 and assuming the toothpicks have length 4, 3, and 2.

1

1, 5, 13, 25, 37, 53, 81, 113, 133, 149, 177, 213, 253, 313, 401, 481, 517, 533, 561, 597, 637, 697, 785, 869, 925, 985, 1077, 1189, 1329, 1537, 1793, 1985, 2053, 2069, 2097, 2133, 2173, 2233, 2321, 2405, 2461, 2521, 2613, 2725, 2865, 3073, 3329, 3525, 3613

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

The first differences give A147646.

LINKS

Table of n, a(n) for n=0..48.

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) = 1 + 4*A153006(n) = 1 + A159795(n).

CROSSREFS

Cf. A139250, A152980, A153006, A147646, A159795, A160128, A160420, A160422, A160425, A182618, A194800, A194802.

Sequence in context: A066782 A094553 A094079 * A112558 A248160 A098972

Adjacent sequences: A194808 A194809 A194810 * A194812 A194813 A194814

KEYWORD

nonn

AUTHOR

Omar E. Pol, Oct 24 2011

STATUS

approved