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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A039809 a(n), n>1, doubles under transform T where Ta is matrix product of Partition Triangle A008284 with a. 3
1, 1, 2, 5, 12, 32, 83, 223, 594, 1600, 4297, 11589, 31216, 84212, 227091, 612712, 1652913, 4459962, 12033405, 32469682, 87611105, 236402465, 637884103, 1721218224, 4644392797, 12532091909, 33815653370, 91245738923 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..28.

FORMULA

a(1) = 1, a(n) = Sum_{i=1..n-1} A008284(n, i)*a(i).

a(n+1) = Sum_{k=0..n} A081719(n,k). - Philippe Deléham, Sep 30 2006

EXAMPLE

So a(7) = T(7,1)*a(1) + T(7,2)*a(2) + ... + T(7,6)*a(6) = 1*1 + 3*1 + 4*2 + 3*5 + 2*12 + 1*32 = 1 + 3 + 8 + 15 + 24 + 32 = 83.

CROSSREFS

Sequence in context: A293868 A162434 A277863 * A173611 A292211 A293348

Adjacent sequences:  A039806 A039807 A039808 * A039810 A039811 A039812

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower, Feb 15 1999

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 22 10:07 EDT 2019. Contains 321421 sequences. (Running on oeis4.)