A293707 - OEIS

%I #29 Dec 22 2018 07:50:27

%S 2,84,137664,14784353280,159433923516825600,

%T 247133428169618164285440000,74871582187843476288006745227264000000,

%U 5793842294883032778309293201687815335916339200000000,145059336151890972759838967800541420103566785450351578316800000000000

%N Permanent of a Hankel matrix with factorial elements.

%H Vaclav Kotesovec, <a href="/A293707/b293707.txt">Table of n, a(n) for n = 1..28</a>

%t Table[Permanent[Table[(i + j)!, {i, 1, n}, {j, 1, n}]], {n, 1, 15}]

%o (PARI) {a(n) = matpermanent(matrix(n, n, i, j, (i+j)!))}

%o for(n=1, 10, print1(a(n), ", ")) \\ _Vaclav Kotesovec_, Dec 21 2018

%Y Cf. A108078.

%K nonn

%O 1,1

%A _Vaclav Kotesovec_, Apr 17 2018