4,1
A027026(n)+(n+1)(n+2)/2-3.
Sequence in context: A061246 A132208 A066595 this_sequence A075985 A139933 A079304
Adjacent sequences: A027083 A027084 A027085 this_sequence A027087 A027088 A027089
nonn
Clark Kimberling (ck6(AT)evansville.edu)
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