login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A125804
Main diagonal of table
A125800
.
2
1, 2, 12, 238, 15200, 3013980, 1828979530, 3373190565626, 18837339867421686, 317817051628161116674, 16176220447967300610844988, 2481251352301850541661479580329, 1146112129196402690505198891390847384
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,2
COMMENTS
Table
A125800
is related to partitions into powers of 3; column k of
A125800
equals row sums of matrix power
A078122
^k, where triangle
A078122
shifts left one column under matrix cube.
LINKS
Table of n, a(n) for n=0..12.
PROG
(PARI) a(n)=local(q=3, A=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i || j==1, B[i, j]=1, B[i, j]=(A^q)[i-1, j-1]); )); A=B); return(sum(c=0, n, (A^n)[n+1, c+1]))
CROSSREFS
Cf.
A125800
,
A078122
; columns:
A078125
,
A078124
,
A125801
,
A125802
,
A125803
;
A125805
(antidiagonal sums).
Sequence in context:
A166316
A011840
A296462
*
A119700
A141083
A257665
Adjacent sequences:
A125801
A125802
A125803
*
A125805
A125806
A125807
KEYWORD
nonn
AUTHOR
Paul D. Hanna
, Dec 10 2006
STATUS
approved
Lookup
|
Welcome
|
Wiki
|
Register
|
Music
|
Plot 2
|
Demos
|
Index
|
Browse
|
More
|
WebCam
Contribute new seq. or comment
|
Format
|
Style Sheet
|
Transforms
|
Superseeker
|
Recents
The OEIS Community
| Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified April 17 21:01 EDT 2024. Contains 371767 sequences. (Running on oeis4.)