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A060242 a(n) = (2^n - 1)*(4^n - 1). 1

%I

%S 0,3,45,441,3825,31713,257985,2080641,16711425,133955073,1072692225,

%T 8585738241,68702695425,549688696833,4397778059265,35183298314241,

%U 281470681677825,2251782633684993,18014329789743105,144114913197424641

%N a(n) = (2^n - 1)*(4^n - 1).

%C Conjecture: satisfies a linear recurrence having signature (15, -70, 120, -64). - _Harvey P. Dale_, May 13 2019

%H Harry J. Smith, <a href="/A060242/b060242.txt">Table of n, a(n) for n = 0..100</a>

%t Table[(2^n-1)(4^n-1),{n,0,20}] (* _Harvey P. Dale_, May 13 2019 *)

%o (PARI) { for (n=0, 100, write("b060242.txt", n, " ", (2^n - 1)*(4^n - 1)); ) } \\ _Harry J. Smith_, Jul 04 2009

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Mar 22 2001

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Last modified June 18 17:05 EDT 2019. Contains 324214 sequences. (Running on oeis4.)