A127932 - OEIS

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A127932

a(4n)=4n+1, a(4n+1)=a(4n+2)=a(4n+3)=4n+4.

1, 4, 4, 4, 5, 8, 8, 8, 9, 12, 12, 12, 13, 16, 16, 16, 17, 20, 20, 20, 21, 24, 24, 24, 25, 28, 28, 28, 29, 32, 32, 32, 33, 36, 36, 36, 37, 40, 40, 40, 41, 44, 44, 44, 45, 48, 48, 48, 49, 52, 52, 52, 53, 56, 56, 56, 57, 60, 60, 60, 61, 64, 64, 64, 65, 68, 68, 68, 69, 72, 72, 72 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)=(1/12)Sum{k=0..n}{-(k mod 4)+2[(k+1) mod 4]+11[(k+2) mod 4]-4[(k+3) mod 4]} [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 18 2008]`
	CROSSREFS	`Sequence in context: A036854 A036858 A131957 * A006075 A074904 A010304` `Adjacent sequences: A127929 A127930 A127931 * A127933 A127934 A127935`
	KEYWORD	`nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Apr 06 2007`

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Last modified February 17 07:41 EST 2012. Contains 205998 sequences.