A091957 - OEIS

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A091957

a(1)=0, a(2)=1, a(n)=A000217(a(n-1)) + A000217(a(n-2)).

0, 1, 1, 2, 4, 13, 101, 5242, 13747054, 94490767454888, 4464252567107002358694986701, 9964775491460730298984873909049635615687553262572198767 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	PROG	`(PARI) t(n)=n*(n+1)/2 v=vector(12) v[2]=1 for (i=3, 12, v[i]=t(v[i-1])+t(v[i-2])) v`
	CROSSREFS	`Sequence in context: A132786 A103845 A055463 * A056678 A193232 A189486` `Adjacent sequences: A091954 A091955 A091956 * A091958 A091959 A091960`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Mar 13 2004`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.