a(n) = 2^(-1 + (n + n mod 2)/2)*abs(permanent(M_n)) where M_n is the n X n matrix M_n(j, k) = cos(Pi*j*k/n) if n >= 1 and a(0) = 1.
A347929
a(n) = 2^(-1 + (n + n mod 2)/2)*abs(permanent(M_n)) where M_n is the n X n matrix M_n(j, k) = cos(Pi*j*k/n) if n >= 1 and a(0) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =0a(5) =6a(6) =12a(7) =12a(8) =96a(9) =108a(10) =240a(11) =380a(12) =0a(13) =28428a(14) =8176a(15) =16200a(16) =387072a(17) =2817324a(18) =6065280a(19) =4604796a(20) =56832000a(21) =14574168a(22) =2092107072a(23) =13994428360a(24) =8725045248a(25) =162749055000
External references
- oeis: A347929