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1, 5, 10, 19, 33, 56, 93, 153, 250, 407, 661, 1072, 1737, 2813, 4554, 7371, 11929, 19304, 31237, 50545, 81786, 132335, 214125, 346464, 560593, 907061, 1467658, 2374723, 3842385, 6217112, 10059501, 16276617, 26336122
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., pp. 189, 194-196.
J. Roberts, Lure of the Integers, Math. Assoc. America,1992, p. 224.
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FORMULA
| a(n)=4F(n+1)+F(n)-4; where F(x) is the (x+1)st Fibonacci number(A000045).
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EXAMPLE
| a(n)=a(n-1)+a(n-2)+4; a(0)=1; n >= 1.
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MATHEMATICA
| a=0; b=1; lst={a, b}; Do[z=a+b+4; AppendTo[lst, z]; a=b; b=z, {n, 50}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 16 2010]
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CROSSREFS
| Cf. A000285.
a(n) = A101220(4, 1, n+1).
Sequence in context: A178132 A047882 A184260 * A147390 A115825 A115774
Adjacent sequences: A053308 A053309 A053310 * A053312 A053313 A053314
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KEYWORD
| easy,nonn
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AUTHOR
| Barry E. Williams, Mar 06 2000
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