Number of 4 X 4 matrices with nonnegative integer entries and row and column sums equal to n.

A001496

Number of 4 X 4 matrices with nonnegative integer entries and row and column sums equal to n.

Terms

    a(0) =1a(1) =24a(2) =282a(3) =2008a(4) =10147a(5) =40176a(6) =132724a(7) =381424a(8) =981541a(9) =2309384a(10) =5045326a(11) =10356424a(12) =20158151a(13) =37478624a(14) =66952936a(15) =115479776a(16) =193077449a(17) =313981688a(18) =498033282a(19) =772409528a(20) =1173759851a(21) =1750812624a(22) =2567527260a(23) =3706873040

External references