id:A084173 - OEIS Search Results

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A sum of generalized Jacobsthal numbers.

+0
1

1, 3, 5, 13, 27, 59, 121, 249, 503, 1015, 2037, 4085, 8179, 16371, 32753, 65521, 131055, 262127, 524269, 1048557, 2097131, 4194283, 8388585, 16777193, 33554407, 67108839, 134217701, 268435429, 536870883, 1073741795, 2147483617 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n)=A084172(n)+A083579(n)`
	FORMULA	`a(n)=2^(n+1)-(2n+1)/2-(-1)^n/2.`
	CROSSREFS	`Sequence in context: A103792 A076156 A141630 this_sequence A000631 A026569 A035082` `Adjacent sequences: A084170 A084171 A084172 this_sequence A084174 A084175 A084176`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 18 2003`

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

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