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A170907 Row sums in triangle A170906. 5
1, 4, 8, 13, 20, 28, 37, 47, 59, 73, 87, 101, 118, 137, 156, 176, 198, 223, 248, 271, 299, 328, 357, 386, 418, 454, 489, 522, 558, 598, 638, 678, 720, 766, 812, 858, 907, 956, 1004, 1048, 1104, 1161, 1217, 1268, 1325, 1386, 1446, 1505, 1567, 1635, 1703, 1765 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Total number of cells that get turned ON in the n-th 30-60-90 triangle of hexagons described in A170906.

I wish I had a recurrence for this sequence!

LINKS

David Applegate, Table of n, a(n) for n = 1..5989

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

CROSSREFS

Cf. A170906, A169757, A169758, A163862 (values at powers of 2).

Sequence in context: A064609 A265382 A056738 * A143978 A071994 A023661

Adjacent sequences:  A170904 A170905 A170906 * A170908 A170909 A170910

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 24 2010

EXTENSIONS

More terms from R. J. Mathar, Jan 28 2010

STATUS

approved

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Last modified February 21 06:38 EST 2018. Contains 299390 sequences. (Running on oeis4.)