0,2

Convolution of A000400 (powers of 6) with A009968 (powers of 24).

G.f.: 1/((1-3*2*1*x)*(1-4*3*2*x)).

a(n)=A089504(n+2, 2), n>=0. a(n)= (4*(4*3*2)^n - (3*2*1)^n)/3 = (2^n)*(2^(2*(n+1))-1)*3^(n-1).

Cf. A089505, A089513-4.

Sequence in context: A035520 A122186 A053509 this_sequence A045689 A096722 A049394

Adjacent sequences: A089504 A089505 A089506 this_sequence A089508 A089509 A089510

nonn,easy

Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Dec 01 2003