Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 polyhexes in any orientation on a planar n X n X n triangular grid.

A155238

Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 polyhexes in any orientation on a planar n X n X n triangular grid.

Terms

    a(0) =1a(1) =4a(2) =13a(3) =28a(4) =125a(5) =568a(6) =3422a(7) =27373a(8) =226848a(9) =2490002a(10) =34395449a(11) =564841115a(12) =11835714950a(13) =297683710781

External references