Fifth convolution of A115140.

Terms

a(0) =1a(1) =-5a(2) =5a(3) =0a(4) =0a(5) =-1a(6) =-5a(7) =-20a(8) =-75a(9) =-275a(10) =-1001a(11) =-3640a(12) =-13260a(13) =-48450a(14) =-177650a(15) =-653752a(16) =-2414425a(17) =-8947575a(18) =-33266625a(19) =-124062000a(20) =-463991880a(21) =-1739969550a(22) =-6541168950a(23) =-24647883000a(24) =-93078189750a(25) =-352207870014