id:A026044 - OEIS Search Results

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a(n) = (d(n)-r(n))/2, where d = A026043 and r is the periodic sequence with fundamental period (1,1,0,0).

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22, 33, 49, 70, 97, 132, 176, 229, 292, 367, 455, 556, 671, 802, 950, 1115, 1298, 1501, 1725, 1970, 2237, 2528, 2844, 3185, 3552, 3947, 4371, 4824, 5307, 5822, 6370, 6951, 7566, 8217, 8905, 9630, 10393, 11196, 12040, 12925, 13852, 14823, 15839, 16900, 18007, 19162, 20366, 21619, 22922, 24277 (list; graph; listen)

	OFFSET	`5,1`
	FORMULA	`a(n)=(n + 5)(2n^2 + 11n + 54)/12 - 1/4 - (1/4)cos(Pin/2) - (1/4)sin(Pi*n/2) [From Richard Choulet (richardchoulet(AT)yahoo.fr), Dec 13 2008]`
	CROSSREFS	`Sequence in context: A067035 A074054 A067287 this_sequence A120146 A138840 A116063` `Adjacent sequences: A026041 A026042 A026043 this_sequence A026045 A026046 A026047`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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