a(0)=0, a(1)=1, a(n)=((2*n-1)*a(n-1)-5*n*a(n-2))/(n-1).

Terms

a(0) =0a(1) =1a(2) =3a(3) =0a(4) =-20a(5) =-45a(6) =21a(7) =308a(8) =540a(9) =-585a(10) =-4235a(11) =-5676a(12) =11232a(13) =54145a(14) =51975a(15) =-182400a(16) =-654160a(17) =-380205a(18) =2680425a(19) =7516400a(20) =1320900a(21) =-36753255a(22) =-82175665a(23) =24032700a(24) =477852900a(25) =850446025a(26) =-749925189a(27) =-5944471092a(28) =-8220606800a(29) =14049061455