|
| |
| |
|
|
|
0, 1, 2, 8, 19, 54, 130, 334, 806, 1995, 4816, 11746, 28357, 68748, 165972, 401388, 969036, 2341141, 5652014, 13649228, 32952151, 79563330, 192082870, 463752730, 1119598130, 2703006111, 6525634012, 15754412038, 38034515209, 91823775384, 221682203880, 535188986904, 1292060510616, 3119311948585
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
REFERENCES
|
Gy. Tasi and F. Mizukami, Quantum algebraic-combinatoric study of the conformational properties of n-alkanes, J. Math. Chemistry, 25, 1999, 55-64 (see p. 63).
|
|
|
LINKS
|
Table of n, a(n) for n=0..33.
|
|
|
FORMULA
|
(1/4) [Pell(n+3) - Pell(n+2) - 2*Pell(floor((n+4)/2)) + 1 ] (conjectured), with Pell(n) = A000129(n). - Ralf Stephan, Jun 2 2007
Empirical g.f.: -x*(x^2-x+1) / ((x-1)*(x^2+2*x-1)*(x^4+2*x^2-1)). - Colin Barker, Apr 08 2013
|
|
|
CROSSREFS
|
Sequence in context: A000158 A101427 A126877 * A026588 A026572 A074797
Adjacent sequences: A107766 A107767 A107768 * A107770 A107771 A107772
|
|
|
KEYWORD
|
more,nonn
|
|
|
AUTHOR
|
Emeric Deutsch, Jun 12 2005
|
|
|
EXTENSIONS
|
Entry revised by N. J. A. Sloane, Jul 29 2011
|
|
|
STATUS
|
approved
|
| |
|
|
