Matrix inverse of triangle A121336, where A121336(n,k) = C( n*(n+1)/2 + n-k + 2, n-k) for n>=k>=0.

Terms

a(0) =1a(1) =-4a(2) =1a(3) =3a(4) =-6a(5) =1a(6) =-12a(7) =9a(8) =-9a(9) =1a(10) =-117a(11) =-26a(12) =26a(13) =-13a(14) =1a(15) =-1656a(16) =-216a(17) =-69a(18) =63a(19) =-18a(20) =1a(21) =-28506a(22) =-3396a(23) =-294a(24) =-212a(25) =132a(26) =-24a(27) =1a(28) =-578274a(29) =-63116