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1, 3, 33, 387, 4161, 42243, 413793, 3959427, 37281921, 347066883, 3204309153, 29403732867, 268588249281, 2444976817923, 22198569382113, 201143570584707, 1819787258282241, 16444551185679363, 148466221699088673
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| G.f.: 1/(1-9*x)-1/(1-7*x)+1/(1-x). E.g.f.: e^(9*x)-e^(7*x)+e^x.
a(n)=16*a(n-1)-63*a(n-2)+48 with a(0)=1, a(1)=3 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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CROSSREFS
| A155638, A155639, A155640, A155641, A155642, A155643, A155644, A155645, A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657, A155658, A155659
Sequence in context: A080488 A082778 A163476 * A009502 A011922 A071405
Adjacent sequences: A155657 A155658 A155659 * A155661 A155662 A155663
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KEYWORD
| nonn
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AUTHOR
| Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 31 2009
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