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, 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

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