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A074513
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1^n + 4^n + 7^n.
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0
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3, 12, 66, 408, 2658, 17832, 121746, 839928, 5830338, 40615752, 283523826, 1981521048, 13858064418, 96956119272, 678491508306, 4748635251768, 33237225536898, 232647693856392, 1628482317387186, 11399170063280088
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| G.f.: 1/(1-x)+1/(1-4*x)+1/(1-7*x). E.g.f.: e^x+e^(4*x)+e^(7*x). [From Mohammad K. Azarian (azarian(AT)evansville.edu), Dec 26 2008]
a(n)=11*a(n-1)-28*a(n-2)+18 with a(0)=3, a(1)=12 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 21 2010]
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MATHEMATICA
| Table[1^n + 4^n + 7^n, {n, 0, 20}]
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CROSSREFS
| Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A183273 A082987 A086836 * A007871 A058790 A199746
Adjacent sequences: A074510 A074511 A074512 * A074514 A074515 A074516
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 23 2002
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