id:A101509 - OEIS Search Results

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Binomial transform of tau(n).

+0
2

1, 3, 7, 16, 35, 75, 159, 334, 696, 1442, 2976, 6123, 12562, 25706, 52492, 107014, 217877, 443061, 899957, 1826078, 3701783, 7498261, 15178255, 30706320, 62085915, 125465715, 253415981, 511608490, 1032427637, 2082680887 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of A101508.`
	FORMULA	`a(n)=sum{k=0..n, sum{i=0..n, if(mod(i+1, k+1)=0, binomial(n, i), 0)}}.`
	CROSSREFS	`Sequence in context: A026767 A133124 A104004 this_sequence A099325 A026778 A023523` `Adjacent sequences: A101506 A101507 A101508 this_sequence A101510 A101511 A101512`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Dec 05 2004`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

AT&T Labs Research