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A144843 a(n) = (6^n - 2^n)^2 / 16. 1
1, 64, 2704, 102400, 3748096, 135675904, 4893282304, 176265625600, 6346852335616, 228502162898944, 8226263614357504, 296147719133593600, 10661344637077159936, 383808727914259677184, 13817118056668205154304, 497416296261117961830400, 17906987220053014721069056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

Index entries for linear recurrences with constant coefficients, signature (52,-624,1728).

FORMULA

From R. J. Mathar, Sep 24 2008: (Start)

a(n) = 81*36^(n-2) + 4^(n-2) - 18*12^(n-2).

G.f.: x*(1+12x)/((1-36x)*(1-4x)*(1-12x)). (End)

a(n) = A016129(n-1)^2. - Philippe Deléham, Nov 26 2008

MATHEMATICA

Table[(6^n-2^n)^2/16, {n, 20}] (* or *) Table[4^(n-2) (3^n-1)^2, {n, 20}] (* Harvey P. Dale, Apr 15 2020 *)

CROSSREFS

Sequence in context: A269291 A203256 A265632 * A284228 A017319 A036531

Adjacent sequences:  A144840 A144841 A144842 * A144844 A144845 A144846

KEYWORD

nonn,easy

AUTHOR

Al Hakanson (hawkuu(AT)gmail.com), Sep 22 2008

EXTENSIONS

More terms from R. J. Mathar, Sep 24 2008

STATUS

approved

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Last modified May 19 05:04 EDT 2022. Contains 353826 sequences. (Running on oeis4.)