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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A113108 Triangle T, read by rows, equal to the matrix square of triangle A113106, which satisfies the recurrence: A113106(n,k) = [A113106^5](n-1,k-1) + [A113106^5](n-1,k). 4
1, 2, 1, 16, 12, 1, 440, 416, 62, 1, 43600, 48320, 10016, 312, 1, 16698560, 20765520, 5394320, 246016, 1562, 1, 26098464448, 35382716032, 10854556720, 646408320, 6116016, 7812, 1, 172513149018752, 250136469031744, 87213434633152 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..30.

EXAMPLE

Triangle begins:

1;

2,1;

16,12,1;

440,416,62,1;

43600,48320,10016,312,1;

16698560,20765520,5394320,246016,1562,1;

26098464448,35382716032,10854556720,646408320,6116016,7812,1; ...

PROG

(PARI) {T(n, k)=local(M=matrix(n+1, n+1)); for(r=1, n+1, for(c=1, r, M[r, c]=if(r==c, 1, if(c>1, (M^5)[r-1, c-1])+(M^5)[r-1, c]))); return((M^2)[n+1, k+1])}

CROSSREFS

Cf. A113106.

Sequence in context: A095850 A247125 A290315 * A162005 A013125 A012967

Adjacent sequences:  A113105 A113106 A113107 * A113109 A113110 A113111

KEYWORD

nonn,tabl

AUTHOR

Paul D. Hanna, Oct 14 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 09:02 EST 2018. Contains 299384 sequences. (Running on oeis4.)