1,2

|a(n)-a(n-1)| = n-1 for all integers >= 2.

Ray Chandler, Table of n, a(n) for n=1..90

Cf. A139695.

Sequence in context: A256998 A303641 A137282 * A308049 A084332 A081145

Adjacent sequences: A139693 A139694 A139695 * A139697 A139698 A139699

nonn

Leroy Quet, Apr 29 2008

a(10)-a(90) from Ray Chandler, Jul 08 2009

approved