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A100103 2^(2*n)-(2*n). 0
1, 2, 12, 58, 248, 1014, 4084, 16370, 65520, 262126, 1048556, 4194282, 16777192, 67108838, 268435428, 1073741794, 4294967264, 17179869150, 68719476700, 274877906906, 1099511627736, 4398046511062, 17592186044372, 70368744177618 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

Guo-Niu Han, Enumeration of Standard Puzzles

Guo-Niu Han, Enumeration of Standard Puzzles [Cached copy]

Index entries for linear recurrences with constant coefficients, signature (6,-9,4).

FORMULA

a(n) = 6*a(n-1)-9*a(n-2)+4*a(n-3). G.f.: (1-4*x+9*x^2)/((1-x)^2*(1-4*x)). [Colin Barker, May 29 2012]

MAPLE

seq(2^(2*n)-(2*n), n=0..20);

seq(2^(2*n)-2*n, n=0..25); (Deutsch)

CROSSREFS

Bisection of A000325.

Sequence in context: A005038 A094780 A268594 * A281028 A054145 A285364

Adjacent sequences:  A100100 A100101 A100102 * A100104 A100105 A100106

KEYWORD

nonn,easy

AUTHOR

Jorge Coveiro, Dec 26 2004

STATUS

approved

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Last modified February 18 09:39 EST 2020. Contains 332011 sequences. (Running on oeis4.)