a(n) = 2^(n - 1)*permanent(M_n)^2 where M_n is the n X n matrix M_n(j, k) = cos(Pi*j*k/n).
A347281
a(n) = 2^(n - 1)*permanent(M_n)^2 where M_n is the n X n matrix M_n(j, k) = cos(Pi*j*k/n).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =0a(4) =36a(5) =288a(6) =144a(7) =18432a(8) =11664a(9) =115200a(10) =144400a(11) =0a(12) =808151184a(13) =133693952a(14) =262440000a(15) =299649466368
External references
- oeis: A347281