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0, 6, 72, 702, 6480, 58806, 530712, 4780782, 43040160, 387400806, 3486725352, 31380882462, 282429005040, 2541864234006, 22876787671992, 205891117745742, 1853020145805120, 16677181570526406, 150094634909578632, 1350851716510730622
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 199, #3.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index to sequences with linear recurrences with constant coefficients, signature (12,-27).
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FORMULA
| a(n) = 9^n - 3^n; a(n) = 12*a(n-1)-27*a(n-2); [From Vincenzo Librandi, Jun 03 2011]
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PROG
| (MAGMA) [9^n-3^n: n in [0..20]]; // Vincenzo Librandi, Jun 03 2011
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CROSSREFS
| Cf. A059379, A059380, A059409.
Sequence in context: A061690 A133678 A005548 * A200978 A099673 A105928
Adjacent sequences: A059407 A059408 A059409 * A059411 A059412 A059413
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 30 2001
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