Analog of A097717 in base 3.

Terms

a(0) =1a(1) =32a(2) =3a(3) =88a(4) =260a(5) =15192960a(6) =28a(7) =61616a(8) =9a(10) =55a(11) =182208a(12) =132538588a(13) =2240a(14) =165a(15) =32048741728a(16) =1185506696a(18) =247a(21) =179872a(22) =14559920a(24) =130885300a(26) =27