Triangle read by rows: T(n, k) = (n+1)!*(1/k + 1/(n-k+1)).

Terms

a(0) =4a(1) =9a(2) =9a(3) =32a(4) =24a(5) =32a(6) =150a(7) =100a(8) =100a(9) =150a(10) =864a(11) =540a(12) =480a(13) =540a(14) =864a(15) =5880a(16) =3528a(17) =2940a(18) =2940a(19) =3528a(20) =5880a(21) =46080a(22) =26880a(23) =21504a(24) =20160a(25) =21504a(26) =26880a(27) =46080a(28) =408240a(29) =233280