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 A060242 a(n) = (2^n - 1)*(4^n - 1). 1
 0, 3, 45, 441, 3825, 31713, 257985, 2080641, 16711425, 133955073, 1072692225, 8585738241, 68702695425, 549688696833, 4397778059265, 35183298314241, 281470681677825, 2251782633684993, 18014329789743105, 144114913197424641 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Conjecture: satisfies a linear recurrence having signature (15, -70, 120, -64). - Harvey P. Dale, May 13 2019 LINKS Harry J. Smith, Table of n, a(n) for n = 0..100 MATHEMATICA Table[(2^n-1)(4^n-1), {n, 0, 20}] (* Harvey P. Dale, May 13 2019 *) PROG (PARI) { for (n=0, 100, write("b060242.txt", n, " ", (2^n - 1)*(4^n - 1)); ) } \\ Harry J. Smith, Jul 04 2009 CROSSREFS Sequence in context: A073595 A117972 A061532 * A271236 A270064 A141445 Adjacent sequences:  A060239 A060240 A060241 * A060243 A060244 A060245 KEYWORD nonn,changed AUTHOR N. J. A. Sloane, Mar 22 2001 STATUS approved

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Last modified May 25 11:17 EDT 2019. Contains 323539 sequences. (Running on oeis4.)