|
Search: id:A108984
|
|
| |
|
| 1, 8, 55, 386, 2701, 18908, 132355, 926486, 6485401, 45397808, 317784655, 2224492586, 15571448101, 109000136708, 763000956955, 5341006698686, 37387046890801, 261709328235608, 1831965297649255, 12823757083544786
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
a(n) = 6a(n-1) + 7a(n-2), a(0) = 1, a(1) = 8.
a(2n) = 7a(2n-1) - 1; a(2n+1) = 7a(2n) + 1.
O.g.f.: -(1+2x)/[(1+x)(7x-1)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
a(n)=-(1/8)*[(-1)^n-9*7^n], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Nov 19 2008]
|
|
CROSSREFS
|
Sequence in context: A010924 A010918 A019484 this_sequence A160429 A003722 A044146
Adjacent sequences: A108981 A108982 A108983 this_sequence A108985 A108986 A108987
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jul 23 20050
|
|
EXTENSIONS
|
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
|
|
|
Search completed in 0.002 seconds
|
