0,2
A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
a(n)=(5^n/4)*[(3^(n+1))+(-1)^n].
a(n)=10a(n-1)+75a(n-2); a(0)=1.
Cf. A015518.
Sequence in context: A200574 A078516 A144516 * A049380 A200060 A057122
Adjacent sequences: A053534 A053535 A053536 * A053538 A053539 A053540
easy,nonn
Barry E. Williams, Jan 15 2000