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A159331
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Transform of the finite sequence (1, 0, -1, 0, 1, 0, -1) by the T_{1,1} transform (see link)
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1
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2, 4, 9, 23, 55, 126, 293, 680, 1581, 3676, 8546, 19867, 46185, 107367, 249598, 580245, 1348906, 3135826, 7289911, 16946987, 39396965, 91586832, 212913553, 494963960, 1150651606, 2674940451, 6218482101, 14456217007, 33606627270
(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^6)(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)=293, a(7)=680, a(8)=1581 and for n>=6 a(n+3):=3*a(n+2)-2*a(n+1)+a(n)
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CROSSREFS
| A159328, A159329, A159330
Sequence in context: A159329 A159334 A159330 * A135346 A174283 A151404
Adjacent sequences: A159328 A159329 A159330 * A159332 A159333 A159334
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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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