

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
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OFFSET

0,3


COMMENTS

Also number of Etoothpicks after nth stage on the semiinfinite triangular grid. A161332 (the first differences) gives the number of Etoothpicks added at nth 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, Congressus Numerantium, Vol. 206 (2010), 157191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)1) for n >= 2.]
N. J. A. Sloane, A single Etoothpick
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



