id:A081661 - OEIS Search Results

Search: id:A081661

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Partial sums of A081660.

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1

1, 3, 8, 16, 31, 57, 106, 198, 377, 727, 1420, 2796, 5539, 11013, 21950, 43810, 87517, 174915, 349696, 699240, 1398311, 2796433, 5592658, 11185086, 22369921, 44739567, 89478836, 178957348, 357914347, 715828317, 1431656230, 2863312026 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=2^(n+2)/3+(n^2+n-1)/2+(-1)^n/6`
	CROSSREFS	`Cf. A001045.` `Adjacent sequences: A081658 A081659 A081660 this_sequence A081662 A081663 A081664` `Sequence in context: A000233 A002624 A068039 this_sequence A005103 A001978 A077552`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 26 2003`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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