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%I #10 Mar 08 2020 00:21:04
%S 1,1,1,1,6,1,1,60,60,1,1,840,10080,840,1,1,15120,3326400,3326400,
%T 15120,1,1,332640,1816214400,36324288000,1816214400,332640,1,1,
%U 8648640,1482030950400,844757641728000,844757641728000,1482030950400,8648640,1
%N Triangle of numbers where k-th row contains (ij)!/(i!j!) with i+j = k+1, 1 <= i <= k.
%H Andrew Howroyd, <a href="/A046792/b046792.txt">Table of n, a(n) for n = 1..210</a>
%F T(n,k) = (k*(n+1-k))!/(k!*(n+1-k)!). - _Andrew Howroyd_, Mar 07 2020
%e Triangle begins
%e 1;
%e 1, 1;
%e 1, 6, 1;
%e 1, 60, 60, 1;
%e ...
%o (PARI) T(n,k)={(k*(n+1-k))!/(k!*(n+1-k)!)} \\ _Andrew Howroyd_, Mar 07 2020
%K nonn,tabl,easy
%O 1,5
%A _N. J. A. Sloane_
%E More terms from _James A. Sellers_
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