0,2

G.f.: (1-2x)/(1-3x)^3

T(n, 2) in triangle A080419

Sequence in context: A103090 A097554 A055221 this_sequence A026018 A085354 A051198

Adjacent sequences: A080417 A080418 A080419 this_sequence A080421 A080422 A080423

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Feb 19 2003