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A081193 a(n)=6a(n-1)-8a(n-2), a(0)=1, a(1)=9. 0
1, 9, 46, 204, 856, 3504, 14176, 57024, 228736, 916224, 3667456, 14674944, 58710016, 234860544, 939483136, 3758014464, 15032221696, 60129214464, 240517513216, 962071363584, 3848288075776, 15393157545984, 61572640669696 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: (1+3x)/((1-2x)(1-4x)). a(n)=7*4^n/2-5*2^n/2.

CROSSREFS

Sequence in context: A035039 A001926 A085385 * A054140 A110675 A100790

Adjacent sequences:  A081190 A081191 A081192 * A081194 A081195 A081196

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 11 2003

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Last modified February 14 03:03 EST 2012. Contains 205567 sequences.