id:A026039 - OEIS Search Results

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(d(n)-r(n))/5, where d = A026037 and r is the periodic sequence with fundamental period (1,2,0,2,0).

+0
2

2, 4, 8, 13, 21, 31, 44, 61, 81, 106, 135, 169, 209, 254, 306, 364, 429, 502, 582, 671, 768, 874, 990, 1115, 1251, 1397, 1554, 1723, 1903, 2096, 2301, 2519, 2751, 2996, 3256, 3530, 3819, 4124, 4444, 4781, 5134, 5504, 5892, 6297, 6721, 7163, 7624, 8105, 8605, 9126, 9667, 10229, 10813, 11418, 12046, 12696, 13369 (list; graph; listen)

	OFFSET	`3,1`
	FORMULA	`a(n)=(n + 3)(2n^2 + 9n + 22)/30 - 1/5 - ( - 1/25((5 - 5^(1/2))^(1/2) - (5 + 5^(1/2))^(1/2))2^(1/2))sin(2nPi/5) - (1/25((5 - 5^(1/2))^(1/2) + (5 + 5^(1/2))^(1/2))2^(1/2))sin(4n*Pi/5) [From Richard Choulet (richardchoulet(AT)yahoo.fr), Dec 14 2008]`
	CROSSREFS	`Sequence in context: A061866 A130840 A115266 this_sequence A004978 A005282 A046185` `Adjacent sequences: A026036 A026037 A026038 this_sequence A026040 A026041 A026042`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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