Denominator of the sum of all elements of the n X n matrix M with M[i,j] = (-1)^(i+j)*i/j for i,j = 1..n.

A334724

Denominator of the sum of all elements of the n X n matrix M with M[i,j] = (-1)^(i+j)*i/j for i,j = 1..n.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =20a(5) =20a(6) =105a(7) =210a(8) =504a(9) =504a(10) =4620a(11) =4620a(12) =51480a(13) =51480a(14) =9009a(15) =18018a(16) =272272a(17) =272272a(18) =23279256a(19) =23279256a(20) =21162960a(21) =21162960a(22) =446185740a(23) =446185740a(24) =2059318800a(25) =2059318800a(26) =5736673800a(27) =5736673800a(28) =22181805360a(29) =22181805360

External references