login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A113347 Column 1 of triangle A113345, also equals column 0 of A113350^3. 4
1, 6, 39, 327, 3556, 48659, 812462, 16136404, 373415239, 9900007028, 296557405704, 9921937128500, 367181525916035, 14906571298831661, 659191947156441025, 31558799717042019635, 1626968083690674214906 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
A113345 is the matrix square of A113340.
LINKS
PROG
(PARI) a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==i || j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(2*j-1))[i-j+1, 1])); )); A=B); (A^2)[n+2, 2]
CROSSREFS
Cf. A113340, A113345, A113346 (column 0), A113348 (column 2), A113349 (column 3); A113350.
Sequence in context: A007322 A341728 A058191 * A265953 A356335 A246571
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 08 2005
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 March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)