Cube of the Steinbach matrix as a characteristic polynomial triangular array.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-1a(4) =-4a(5) =1a(6) =-1a(7) =4a(8) =11a(9) =-1a(10) =1a(11) =4a(12) =-21a(13) =-23a(14) =1a(15) =1a(16) =-4a(17) =-31a(18) =60a(19) =42a(20) =-1a(21) =-1a(22) =-4a(23) =41a(24) =100a(25) =-171a(26) =-69a(27) =1a(28) =-1a(29) =4