id:A062708 - OEIS Search Results

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Write 0,1,2,3,4,... in a triangular spiral, then a(n) is the sequence found by reading the line from 0 in the direction 0,2,...

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0, 2, 13, 33, 62, 100, 147, 203, 268, 342, 425, 517, 618, 728, 847, 975, 1112, 1258, 1413, 1577, 1750, 1932, 2123, 2323, 2532, 2750, 2977, 3213, 3458, 3712, 3975, 4247, 4528, 4818, 5117, 5425, 5742, 6068, 6403, 6747, 7100, 7462, 7833, 8213, 8602, 9000 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Milan Janjic, Two Enumerative Functions`
	FORMULA	`a(n) = n*(9n-5)/2`
	EXAMPLE	`The spiral begins:` `..........15` `........16..14` `......17..3...13` `....18..4...2...12` `..19..5...0...1...11` `20..6...7...8...9...10`
	CROSSREFS	`Cf. A051682.` `Sequence in context: A084828 A100512 A051474 this_sequence A084910 A124024 A102229` `Adjacent sequences: A062705 A062706 A062707 this_sequence A062709 A062710 A062711`
	KEYWORD	`nonn,easy`
	AUTHOR	`Floor van Lamoen (fvlamoen(AT)hotmail.com), Jul 21 2001`

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Last modified December 4 14:15 EST 2008. Contains 151279 sequences.

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