id:A080817 - OEIS Search Results

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Leading diagonal of triangle in A080818.

+0
4

1, 3, 6, 10, 6, 10, 15, 8, 13, 19, 26, 15, 22, 30, 16, 24, 33, 43, 25, 35, 46, 25, 36, 48, 61, 36, 49, 63, 35, 49, 64, 33, 48, 64, 81, 46, 63, 81, 43, 61, 80, 100, 58, 78, 99, 54, 75, 97, 49, 71, 94, 118, 66, 90, 115, 60, 85, 111, 138, 79, 106, 134, 72, 100, 129, 159, 93, 123 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = (ceil(sqrt(n(n+1)/2)))^2 - n(n-1)/2 a(n) = A048761(A000217(n)) - A000217(n-1) - David Wasserman (wasserma(AT)spawar.navy.mil), May 13 2004`
	CROSSREFS	`Cf. A080818, A080819, A080820.` `Sequence in context: A120028 A065234 A082184 this_sequence A139762 A055262 A138797` `Adjacent sequences: A080814 A080815 A080816 this_sequence A080818 A080819 A080820`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 21 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 13 2004`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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