Ninth convolution of A115140.

Terms

a(0) =1a(1) =-9a(2) =27a(3) =-30a(4) =9a(5) =0a(6) =0a(7) =0a(8) =0a(9) =-1a(10) =-9a(11) =-54a(12) =-273a(13) =-1260a(14) =-5508a(15) =-23256a(16) =-95931a(17) =-389367a(18) =-1562275a(19) =-6216210a(20) =-24582285a(21) =-96768360a(22) =-379629720a(23) =-1485507600a(24) =-5801732460a(25) =-22626756594a(26) =-88152205554a(27) =-343176898988