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A161334 Numbers of snowflake sequence, divided by 2: a(n) = A161330(n)/2. 3
0, 1, 4, 7, 10, 19, 22, 31, 40, 49, 64, 73, 88, 109, 112, 121, 130, 145, 172, 187, 226, 247, 274, 313, 334, 367, 406, 415, 436, 457, 484, 529, 562, 625, 670, 715, 766, 799, 838, 883, 928, 973, 1000, 1033, 1090, 1129, 1192, 1255, 1306, 1357, 1426, 1477 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Also number of E-toothpicks after n-th stage on the semi-infinite triangular grid. A161332 (the first differences) gives the number of E-toothpicks added at n-th stage. - Omar E. Pol, Jan 07 2014

LINKS

Table of n, a(n) for n=0..51.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata

N. J. A. Sloane, A single E-toothpick

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

CROSSREFS

Cf. A139250, A161328, A161330, A161331, A161332, A161333.

Sequence in context: A208773 A088408 A027752 * A111981 A080922 A227686

Adjacent sequences:  A161331 A161332 A161333 * A161335 A161336 A161337

KEYWORD

nonn

AUTHOR

Omar E. Pol, Jun 07 2009

EXTENSIONS

More terms from Omar E. Pol, Jan 07 2014

STATUS

approved

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Last modified October 17 14:25 EDT 2018. Contains 316281 sequences. (Running on oeis4.)