login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032100 "BHK" (reversible, identity, unlabeled) transform of 1,3,5,7... 1
1, 3, 8, 18, 54, 152, 472, 1410, 4310, 12952, 39144, 117554, 353590, 1061208, 3186488, 9560866, 28691286, 86078168, 258260680, 774795090, 2324463926, 6973431064, 20920529304, 62761705922, 188285826262, 564857832984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..1000

C. G. Bower, Transforms (2)

Index entries for linear recurrences with constant coefficients, signature (5,-4,-12,21,-9).

FORMULA

G.f.: x*(3*x^6-4*x^5+11*x^4+2*x^3-3*x^2-2*x+1)/((1-3*x)*(1-3*x^2)*(1-x)^2).

a(n) = 5*a(n-1) - 4*a(n-2) - 12*a(n-3) + 21*a(n-4) - 9*a(n-5) for n > 7. - Andrew Howroyd, Aug 31 2018

PROG

(PARI) Vec((1 - 2*x - 3*x^2 + 2*x^3 + 11*x^4 - 4*x^5 + 3*x^6)/((1 - 3*x)*(1 - 3*x^2)*(1 - x)^2) + O(x^40)) \\ Andrew Howroyd, Aug 31 2018

CROSSREFS

Sequence in context: A066143 A110045 A108931 * A226593 A023371 A124086

Adjacent sequences:  A032097 A032098 A032099 * A032101 A032102 A032103

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 24 01:20 EDT 2018. Contains 316541 sequences. (Running on oeis4.)