0,2

a(n) = GCD of n-th and (n+1)st tetrahedral numbers (A000292). - Ross La Haye (rlahaye(AT)new.rr.com), Sep 13 2003

G.f.: (x^8-2x^5+x^4+2x^3+10x^2+2x+1)/(1-x^3)^3.

Cf. A027625.

Sequence in context: A000170 A038216 A145911 this_sequence A096668 A114232 A070730

Adjacent sequences: A027623 A027624 A027625 this_sequence A027627 A027628 A027629

nonn,frac

N. J. A. Sloane (njas(AT)research.att.com).