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A159330
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Transform of the finite sequence (1, 0, -1, 0, 1) by the T_{1,1} transformation (see link)
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1
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2, 4, 9, 23, 55, 126, 292, 679, 1579, 3671, 8534, 19839, 46120, 107216, 249247, 579429, 1347009, 3131416, 7279659, 16923154, 39341560, 91458031, 212614127, 494267879, 1149033414, 2671178611, 6209736884, 14435886844, 33559365375
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| R. Choulet, Curtz-like transformation
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FORMULA
| O.g.f f(z)=((1-z)^2/(1-3*z+2*z^2-z^3))*(1-z^2+z^4)+(z/(1-3*z+2*z^2-z^3))+((1-z+z^2)/(1-3*z+2*z^2-z^3) a(0)=2, a(1)=4, a(2)=9, a(3)=23, a(4)=55, a(5)=126, a(6)=292 and for n>=4 a(n+3)=3*a(n+2)-2*a(n+1)+a(n)
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CROSSREFS
| A159328, A159329
Sequence in context: A187044 A159329 A159334 * A159331 A135346 A174283
Adjacent sequences: A159327 A159328 A159329 * A159331 A159332 A159333
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KEYWORD
| easy,nonn
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AUTHOR
| Richard Choulet (richardchoulet(AT)yahoo.fr), Apr 10 2009
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