0,1

a(n)=binomial(a(n-1)+1, 2), a(0)=7

A000217, A007501, A013589.

Sequence in context: A026664 A058822 A054369 this_sequence A140447 A038934 A041088

Adjacent sequences: A050545 A050546 A050547 this_sequence A050549 A050550 A050551

easy,nice,nonn

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 29 1999