A080817 - OEIS

This site is supported by donations to The OEIS Foundation.

A080817

Leading diagonal of triangle in A080818.

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; refs; listen; history; internal format)

	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 * A139762 A055262 A138797` `Adjacent sequences: A080814 A080815 A080816 * 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`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 00:09 EST 2012. Contains 205978 sequences.