id:A049870 - OEIS Search Results

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a(n)=Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; 3 initial terms required.

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1, 2, 4, 6, 11, 20, 38, 71, 133, 248, 463, 864, 1613, 3011, 5621, 10493, 19588, 36566, 68260, 127425, 237872, 444050, 828935, 1547423, 2888668, 5392451, 10066414, 18791583, 35079383, 65484803, 122244437, 228201074, 425996728 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=2*a(n-1)-a(n-3)+a(n-4); 4 initial terms required.`
	CROSSREFS	`Sequence in context: A026385 A068330 A017993 this_sequence A093970 A107428 A086379` `Adjacent sequences: A049867 A049868 A049869 this_sequence A049871 A049872 A049873`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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