id:A077138 - OEIS Search Results

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a(1) = 1, then if n is even multiply it by the previous term else add to get the next term.

+0
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0, 1, 2, 5, 20, 25, 150, 157, 1256, 1265, 12650, 12661, 151932, 151945, 2127230, 2127245, 34035920, 34035937, 612646866, 612646885, 12252937700, 12252937721, 269564629862, 269564629885, 6469551117240, 6469551117265, 168208329048890 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(1) = 1, a(2n) = 2n*a(2n-1) and a(2n+1) = a(2n) +(2n +1).`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, if(n%2, n+a(n-1), n*a(n-1)))`
	CROSSREFS	`Cf. A047905.` `Sequence in context: A059079 A136900 A136898 this_sequence A056726 A136899 A136882` `Adjacent sequences: A077135 A077136 A077137 this_sequence A077139 A077140 A077141`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 30 2002`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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