Number of symmetric nonnegative integer 7 X 7 matrices with sum of elements equal to 4*n, under action of dihedral group D_4.

A054497

Number of symmetric nonnegative integer 7 X 7 matrices with sum of elements equal to 4*n, under action of dihedral group D_4.

Terms

    a(0) =1a(1) =7a(2) =31a(3) =105a(4) =300a(5) =756a(6) =1732a(7) =3676a(8) =7330a(9) =13870a(10) =25102a(11) =43714a(12) =73612a(13) =120340a(14) =191620a(15) =298012a(16) =453739a(17) =677677a(18) =994565a(19) =1436435a(20) =2044328a(21) =2870296a(22) =3979768a(23) =5454280a(24) =7394660a(25) =9924668a(26) =13195196a(27) =17389028a(28) =22726280a(29) =29470520

External references