Column 2 of triangle A370040.

Terms

a(0) =1a(1) =0a(2) =18a(3) =-19a(4) =185a(5) =-294a(6) =1463a(7) =-2715a(8) =9648a(9) =-19005a(10) =55413a(11) =-111069a(12) =284560a(13) =-568913a(14) =1331790a(15) =-2630648a(16) =5761619a(17) =-11195907a(18) =23296840a(19) =-44461191a(20) =88813155a(21) =-166422196a(22) =321471340a(23) =-591712017a(24) =1111195198a(25) =-2010602744a(26) =3685487712a(27) =-6561391792a(28) =11775930023a(29) =-20647946256