Staircase of coefficients of polynomials used for column g.f.s of triangle A060923.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =11a(5) =-11a(6) =4a(7) =1a(8) =30a(9) =-6a(10) =-23a(11) =12a(12) =1a(13) =58a(14) =123a(15) =-278a(16) =193a(17) =-72a(18) =16a(19) =1a(20) =95a(21) =565a(22) =-715a(23) =-145a(24) =601a(25) =-360a(26) =80a(27) =1a(28) =141a(29) =1590