Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, under row and column permutations.

A052366

Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, under row and column permutations.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =10a(4) =33a(5) =78a(6) =224a(7) =549a(8) =1403a(9) =3292a(10) =7677a(11) =16934a(12) =36581a(13) =75732a(14) =152949a(15) =298784a(16) =569636a(17) =1056500a(18) =1916502a(19) =3396630a(20) =5901524a(21) =10051384a(22) =16820192a(23) =27664756a(24) =44795247a(25) =71442327a(26) =112366941a(27) =174384376a(28) =267289440a(29) =404838044

External references