id:A161910 - OEIS Search Results

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Y-Toothpick sequence starting at the corner of an infinite hexagon from which protudes a half toothpick with an angle = Pi/6.

+0
2

0, 1, 2, 5, 6, 9, 12, 19, 22, 25, 28, 35, 40, 47, 56, 73 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`The sequence gives the number of Y-Toothpicks in the sieve after n rounds. A160123 (the first differences) gives the number added at the nth round.` `See the entries A160120, A161830 and A161426 for more information about Y-Toothpick sequences.`
	FORMULA	`a(n) = (A160120(n+1)-1)/3.`
	CROSSREFS	`Cf. A160120, A160121, A160123, A160406, A161830, A161831.` `Sequence in context: A050487 A046962 A022486 this_sequence A151920 A160714 A094350` `Adjacent sequences: A161907 A161908 A161909 this_sequence A161911 A161912 A161913`
	KEYWORD	`more,nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Jun 21 2009`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.