[seqfan] Re: Matrix sequence
W. Edwin Clark
wclark at mail.usf.edu
Sat Nov 30 07:48:30 CET 2013
With Maple's help I get:
1, 10, 450, 55456, 14480700, 6878394720, 5373548250000, 6427291156586496,
11157501095973529920, 26968983444160450560000, 87808164603589940623344000,
374818412822626584819196231680, 2050842983500342507649178541536000,
14112022767608502582976078751055052800,
120142393609740734132923604417900064000000,
1247685757487613731555240243531523777626112000,
15611215293201211704775763606599418680180549632000,
232779239639608473840862118609020721416520230502400000,
4096457619901863802759384962306684567203571548729315328000
which differs from your results in the 4th term. But this is still not in
the OEIS. In fact 55456 lies in only one sequence (if you don't count A
numbers) which is clearly not the right sequence.
--Edwin Clark
On Sat, Nov 30, 2013 at 12:02 AM, <franktaw at netscape.net> wrote:
> What is the permanent of the matrix:
>
> 1 2 ... n
> n+1 n+2 ... 2n
> ...
> n^2-n+1 n^2-n+2 ... n^2 ?
>
> The sequence appears to start
>
> 1,10,450,55128
>
> from n-1; this is not in the database. (These were hand-calculated.)
>
> Franklin T. Adams-Watters
>
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