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A145544 4*(4^n-3^n). 0
0, 4, 28, 148, 700, 3124, 13468, 56788, 235900, 969844, 3958108, 16068628, 64983100, 262058164, 1054609948, 4237571668, 17007682300, 68202916084, 273328224988, 1094862581908, 4384099373500, 17550344631604, 70243219939228, 281098403995348, 1124770188696700 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Suggested by a discussion on the Sequence Fans Mailing List; the formula is due to Jaume Oliver Lafont.

LINKS

Table of n, a(n) for n=0..24.

Index entries for linear recurrences with constant coefficients, signature (7,-12)

FORMULA

a(n)=4*A005061(n) = 7*a(n-1)-12*a(n-2). G.f.: 4*x/((4*x-1)*(3*x-1)). [From R. J. Mathar, Mar 18 2009]

a(n) = A005061(n)*4. [From Omar E. Pol, Mar 18 2009]

CROSSREFS

Cf. A005061. [From Omar E. Pol, Mar 18 2009]

Sequence in context: A320397 A273611 A043013 * A006302 A272992 A272747

Adjacent sequences:  A145541 A145542 A145543 * A145545 A145546 A145547

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 18 2009

STATUS

approved

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Last modified September 29 04:50 EDT 2022. Contains 357082 sequences. (Running on oeis4.)