Triangle read by rows: coefficients of the chromatic polynomial of the n-Hanoi graph.

Terms

a(0) =0a(1) =2a(2) =-3a(3) =1a(4) =0a(5) =40a(6) =-180a(7) =370a(8) =-455a(9) =363a(10) =-190a(11) =63a(12) =-12a(13) =1a(14) =0a(15) =608000a(16) =-6960000a(17) =40524800a(18) =-158999200a(19) =468979200a(20) =-1099617480a(21) =2117585600a(22) =-3419826630a(23) =4697231261a(24) =-5541107684a(25) =5652058863a(26) =-5007519752a(27) =3863562996a(28) =-2598606825a(29) =1522861581