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A053537 A second order recursive sequence. 1
1, 10, 175, 2500, 38125, 568750, 8546875, 128125000, 1922265625, 28832031250, 432490234375 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.

FORMULA

a(n)=(5^n/4)*[(3^(n+1))+(-1)^n].

EXAMPLE

a(n)=10a(n-1)+75a(n-2); a(0)=1.

CROSSREFS

Cf. A015518.

Sequence in context: A200574 A078516 A144516 * A049380 A200060 A057122

Adjacent sequences:  A053534 A053535 A053536 * A053538 A053539 A053540

KEYWORD

easy,nonn

AUTHOR

Barry E. Williams, Jan 15 2000

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Last modified February 15 17:13 EST 2012. Contains 205828 sequences.