id:A098589 - OEIS Search Results

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a(n)=3a(n-1)+2a(n-3).

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1, 3, 9, 29, 93, 297, 949, 3033, 9693, 30977, 98997, 316377, 1011085, 3231249, 10326501, 33001673, 105467517, 337055553, 1077170005, 3442445049, 11001446253, 35158678769, 112360926405, 359085671721, 1147574372701 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/(1-3x-2x^3); a(n)=sum{k=0..floor(n/2), sum{i=0..n, sum{j=0..i, C(n-2k, i)C(i, j)C(j, k)2^k}}}.`
	CROSSREFS	`Cf. A052541.` `Sequence in context: A134325 A123947 A135142 this_sequence A024744 A024964 A061534` `Adjacent sequences: A098586 A098587 A098588 this_sequence A098590 A098591 A098592`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 16 2004`

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

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