Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A056590
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A056590 Fourth column sequence of triangle A056588. +0
2
1, 7, 53, 318, 1784, 9288, 46233, 221859, 1036585, 4742650, 21350264, 94895016, 417562385, 1822824255, 7907350365, 34130697462, 146735898760, 628870859320, 2688466352825, 11470754475675, 48865641344081, 207913415718642 (list; graph; listen)
OFFSET

0,2
FORMULA

a(n)= A056588(n+3, 3), n >= 0.

a(n)= 3^(n+4)-F(n+5)*2^(n+4)+(F(n+3)-2)*F(n+5)*F(n+4)/2; F(n)=A000045(n) (Fibonacci).

G.f.:(1-3*x+8*x^2-3*x^3-3*x^4-4*x^5)/((1+x)*(1-3*x)*(1+x-x^2)*(1-2*x-4*x^2)*(1-3*x+x^2)*(1-4*x-x^2)).

CROSSREFS

Cf. A000045, A056588, A000012, A000071, A056589.

Sequence in context: A147962 A162233 A141911 this_sequence A065542 A015561 A133588

Adjacent sequences: A056587 A056588 A056589 this_sequence A056591 A056592 A056593

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jul 10 2000

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 December 10 00:48 EST 2009. Contains 170565 sequences.

AT&T Labs Research

Legal Notice
© 2009 AT&T Intellectual Property. All Rights Reserved.