Number of inequivalent n X 4 nonnegative integer arrays with row sums 4 and column sums n up to permutations of rows and columns.

A377062

Number of inequivalent n X 4 nonnegative integer arrays with row sums 4 and column sums n up to permutations of rows and columns.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =43a(5) =147a(6) =661a(7) =2649a(8) =10738a(9) =40427a(10) =146206a(11) =498705a(12) =1625621a(13) =5049556a(14) =15044485a(15) =43044068a(16) =118731621a(17) =316347549a(18) =816409799a(19) =2044571309a(20) =4979112445a(21) =11810405775a(22) =27331117859a(23) =61792085482a(24) =136670650003a(25) =296071435108a(26) =628900592847

External references