Coefficients of Hadamard Cartan G_2 self-similar 2^n matrices:M={{2, -1}, {-3, 2}}.

Terms

a(0) =1a(1) =1a(2) =-4a(3) =1a(4) =1a(5) =-16a(6) =30a(7) =-16a(8) =1a(9) =1a(10) =-64a(11) =676a(12) =-2752a(13) =4678a(14) =-2752a(15) =676a(16) =-64a(17) =1a(18) =1a(19) =-256a(20) =13560a(21) =-316160a(22) =3830300a(23) =-25002240a(24) =87841480a(25) =-180202240a(26) =227671110a(27) =-180202240a(28) =87841480a(29) =-25002240