Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, up to rotational symmetry.

A054773

Number of nonnegative integer 4 X 4 matrices with sum of elements equal to n, up to rotational symmetry.

Terms

    a(0) =1a(1) =4a(2) =36a(3) =204a(4) =980a(5) =3876a(6) =13596a(7) =42636a(8) =122666a(9) =326876a(10) =817388a(11) =1931540a(12) =4346404a(13) =9360540a(14) =19390548a(15) =38779380a(16) =75136675a(17) =141430680a(18) =259292440a(19) =463991880a(20) =811990680a(21) =1391975640a(22) =2341057896a(23) =3867821640a(24) =6285222804a(25) =10056336264

External references