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20, 8000, 3200000, 1280000000, 512000000000, 204800000000000, 81920000000000000, 32768000000000000000, 13107200000000000000000, 5242880000000000000000000, 2097152000000000000000000000
(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)=400*a(n-1), n>0; a(0)=20. G.f.: 20/(1-400*x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 28 2008]
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MAPLE
| seq(20^(2*n+1), n=0..10); # Nathaniel Johnston, Jun 25 2011
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PROG
| (MAGMA) [20^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011
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CROSSREFS
| Cf. A004171, A013708-A013724, A013726-A013729.
Sequence in context: A123379 A175015 A135292 * A203308 A109122 A135420
Adjacent sequences: A013722 A013723 A013724 * A013726 A013727 A013728
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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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