Transformed Bernoulli twin numbers.

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-4a(4) =-4a(5) =24a(6) =120a(7) =-960a(8) =-12096a(9) =120960a(10) =3024000a(11) =-36288000a(12) =-1576143360a(13) =22066007040