id:A086714 - OEIS Search Results

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a(1)=4, a(n)=a(n-1)*(a(n-1)-1)/2.

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4, 6, 15, 105, 5460, 14903070, 111050740260915, 6166133456248548335768188155, 19010600900133834176644234577571914951562754277857057935, 180701473292084673118972600633618786284949917294862348623588865291508765442801107068736938092643935008044703145 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(2)=a(1)(a(1)-1)/2 = 43/2 = 6`
	PROGRAM	`(PARI) v=vector(10, i, (i==1)4); for(i=2, 10, v[i]=v[i-1](v[i-1]-1)/2); v`
	CROSSREFS	`Sequence in context: A007135 A073603 A064910 this_sequence A009463 A066260 A141042` `Adjacent sequences: A086711 A086712 A086713 this_sequence A086715 A086716 A086717`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jul 29 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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