0,2

Partial sums are in A016138.

Binomial transform of A016129. Inverse binomial transform of A165148.

a(n) = 10*a(n-1)-21*a(n-2) for n > 1; a(0) = 1, a(1) = 9.

G.f.: (1-x)/((1-3*x)*(1-7*x)).

(MAGMA) [ (3*7^n-3^n)/2: n in [0..19] ];

Cf. A016138, A016129, A165148.

Sequence in context: A089379 A072258 A125372 this_sequence A075045 A081616 A126530

Adjacent sequences: A165144 A165145 A165146 this_sequence A165148 A165149 A165150

nonn

Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Sep 15 2009