Irregular triangle read by rows: numbers (2n-1)!*F(n,m) related to Fekete polynomials.

Terms

a(0) =1a(1) =-2a(2) =10a(3) =-2a(4) =16a(5) =-184a(6) =456a(7) =-184a(8) =16a(9) =-272a(10) =5776a(11) =-30736a(12) =55504a(13) =-30736a(14) =5776a(15) =-272a(16) =7936a(17) =-284288a(18) =2555008a(19) =-8998016a(20) =13801600a(21) =-8998016a(22) =2555008a(23) =-284288a(24) =7936a(25) =-353792a(26) =20594432a(27) =-280444416a(28) =1567885056a(29) =-4267790592