Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A081668
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A081668 Expansion of 2sinh(x) + BesselI_0(2x). +0
2
1, 2, 2, 2, 6, 2, 20, 2, 70, 2, 252, 2, 924, 2, 3432, 2, 12870, 2, 48620, 2, 184756, 2, 705432, 2, 2704156, 2, 10400600, 2, 40116600, 2, 155117520, 2, 601080390, 2, 2333606220, 2, 9075135300, 2, 35345263800, 2, 137846528820, 2, 538257874440, 2 (list; graph; listen)
OFFSET

0,2

COMMENT

Binomial transform of A081668 is A081669.

a(n)-(1-(-1)^n) is the inverse binomial transform of the central trinomial coefficients A002426. - Nour-Eddine Fahssi (fahssin(AT)yahoo.fr), Jan 11 2008

FORMULA

E.g.f. 2sinh(x) + BesselI_0(2x)

G.f.: (2x)/(1 - x^2) + 1/Sqrt[1 - 4 x^2]. - Nour-Eddine Fahssi (fahssin(AT)yahoo.fr), Jan 11 2008

CROSSREFS

Cf. A000984.

Sequence in context: A098555 A097521 A101416 this_sequence A126615 A054274 A053695

Adjacent sequences: A081665 A081666 A081667 this_sequence A081669 A081670 A081671

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 28 2003

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.


AT&T Labs Research