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1, 8, 23, 60, 149, 364, 883, 2136, 5161, 12464, 30095, 72660, 175421, 423508, 1022443, 2468400, 5959249, 14386904, 34733063, 83853036, 202439141, 488731324, 1179901795, 2848534920, 6876971641, 16602478208, 40081928063
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=2*a(n-1)+a(n-2)+6; a(0)=1, a(1)=8.
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EXAMPLE
| a(n)=[ {(7+4*sqrt(2))(1+sqrt(2))^n - (7-4*sqrt(2))(1-sqrt(2))^n}/2*sqrt(2) ]-3.
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MATHEMATICA
| Accumulate[LinearRecurrence[{2, 1}, {1, 7}, 40]] (* From Harvey P. Dale, Jul 22 2011 *)
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CROSSREFS
| Cf. A001333, A000129, A048654, A048655, A048694.
Sequence in context: A027054 A048467 A002765 * A055273 A059209 A099274
Adjacent sequences: A048767 A048768 A048769 * A048771 A048772 A048773
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KEYWORD
| easy,nice,nonn
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AUTHOR
| Barry E. Williams
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jun 20 2000
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