1/6 the number of colorings of a 3 X 3 rhombic- or staggered- hexagonal array with n colors.

A068244

1/6 the number of colorings of a 3 X 3 rhombic- or staggered- hexagonal array with n colors.

Terms

    a(0) =1a(1) =176a(2) =5490a(3) =65600a(4) =455875a(5) =2239776a(6) =8647716a(7) =27962880a(8) =78920325a(9) =200002000a(10) =464447126a(11) =1003294656a(12) =2039332295a(13) =3935444800a(14) =7261533000a(15) =12884914176a(16) =22089914121a(17) =36733221360a(18) =59442494650a(19) =93866696000a(20) =144987663051a(21) =219503536736a(22) =326295822700a(23) =476993088000

External references