Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry.

A054771

Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry.

Terms

    a(0) =1a(1) =3a(2) =13a(3) =43a(4) =129a(5) =327a(6) =761a(7) =1619a(8) =3238a(9) =6098a(10) =10974a(11) =18930a(12) =31550a(13) =50930a(14) =80030a(15) =122666a(16) =183999a(17) =270525a(18) =390755a(19) =555205a(20) =777287a(21) =1073297a(22) =1463583a(23) =1972533a(24) =2630044a(25) =3471508a(26) =4539660a(27) =5884564a(28) =7565868a(29) =9652788

External references