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A118442 Column 0 of triangle A118441, which is the matrix log of triangle A118435. 3
0, 1, -4, -12, 32, 80, -192, -448, 1024, 2304, -5120, -11264, 24576, 53248, -114688, -245760, 524288, 1114112, -2359296, -4980736, 10485760, 22020096, -46137344, -96468992, 201326592, 419430400, -872415232, -1811939328, 3758096384, 7784628224, -16106127360, -33285996544 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

A signed version of A001787(n) = n*2^(n-1).

FORMULA

G.f.: x*(1 - 4*x - 4*x^2)/(1 + 4*x^2)^2.

PROG

(PARI) {a(n)=polcoeff(x*(1 - 4*x - 4*x^2)/(1 + 4*x^2 +x*O(x^n))^2, n)}

CROSSREFS

Cf. A118441 (triangle), A118443 (row sums); A118435, A001787.

Sequence in context: A139756 A001787 A085750 * A038592 A048776 A135248

Adjacent sequences:  A118439 A118440 A118441 * A118443 A118444 A118445

KEYWORD

sign

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Apr 28 2006

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Last modified February 16 21:30 EST 2012. Contains 205971 sequences.