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A141722
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a(n)=4*a(n-1)+21.
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4
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1, 25, 121, 505, 2041, 8185, 32761, 131065, 524281, 2097145, 8388601, 33554425, 134217721, 536870905, 2147483641, 8589934585, 34359738361, 137438953465, 549755813881, 2199023255545, 8796093022201, 35184372088825
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
| a(n)=8*4^n-7. G.f.: (1+20x)/((1-x)(1-4x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008]
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PROG
| (MAGMA) [8*4^n-7: n in [0..30]]; // Vincenzo Librandi, May 31 2011
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CROSSREFS
| Sequence in context: A190875 A205800 A198040 * A090159 A025283 A076433
Adjacent sequences: A141719 A141720 A141721 * A141723 A141724 A141725
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Sep 12 2008
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 13 2008
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008
More terms from Vincenzo Librandi, May 31 2011
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