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Main diagonal of square array A004442=1,0,3,2,5,4 and successive differences. Also main diagonal of square array b(n)=1,1,4,8,16,32,(=submitted A155855 unsigned) and successive differences. Reciprocity: b(n) is main diagonal of square array a(n) and successive differences. a(n)=2^n=A000079 with 3 instead of 2.

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	OFFSET	`0,2`
	FORMULA	`a(0) = 1, a(1) = 3, for n >= 2: a(n) = Sum_(i=0...n-1) a(i). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Nov 16 2009]`
	CROSSREFS	`Sequence in context: A027977 A165438 A049894 this_sequence A153057 A107429 A061273` `Adjacent sequences: A155858 A155859 A155860 this_sequence A155862 A155863 A155864`
	KEYWORD	`nonn,uned`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Jan 29 2009`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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