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21, 9261, 4084101, 1801088541, 794280046581, 350277500542221, 154472377739119461, 68122318582951682301, 30041942495081691894741, 13248496640331026125580781, 5842587018385982521381124421
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
Tanya Khovanova, Recursive Sequences
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FORMULA
| a(n)=441*a(n-1), n>0 ; a(0)=21 . G.f.: 21/(1-441*x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 28 2008]
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MAPLE
| seq(21^(2*n+1), n=0..10); # Nathaniel Johnston, Jun 25 2011
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PROG
| (MAGMA) [21^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011
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CROSSREFS
| Cf. A013708-A013725, A013727-A013729.
Sequence in context: A178327 A176446 A135823 * A159358 A048914 A046183
Adjacent sequences: A013723 A013724 A013725 * A013727 A013728 A013729
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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