0,1

Table of n, a(n) for n=0..78.

a(n)=2+A002024 - Paolo P. Lava, Dec 19 2007

a(n)=A003056(n)+3, a(n)=A003057(n)+1; a(n) = t+3, where t=floor((-1+sqrt(8*n-7))/2). - Boris Putievskiy, May 07 2013

Table[PadRight[{}, n, n+2], {n, 20}]//Flatten (* Harvey P. Dale, Sep 04 2019 *)

Cf. A002024, A003056, A003057.

Sequence in context: A107574 A241163 A053405 * A179841 A059183 A262302

Adjacent sequences: A133193 A133194 A133195 * A133197 A133198 A133199

nonn

Paul Curtz, Oct 09 2007

approved