Seventh convolution of A115140.

Terms

a(0) =1a(1) =-7a(2) =14a(3) =-7a(4) =0a(5) =0a(6) =0a(7) =-1a(8) =-7a(9) =-35a(10) =-154a(11) =-637a(12) =-2548a(13) =-9996a(14) =-38760a(15) =-149226a(16) =-572033a(17) =-2187185a(18) =-8351070a(19) =-31865925a(20) =-121580760a(21) =-463991880a(22) =-1771605360a(23) =-6768687870a(24) =-25880277150a(25) =-99035193894a(26) =-379300783092