4-level binary fanout graph coloring a rectangular array: number of n X 1 0..14 arrays where 0..14 label nodes of a graph with edges 0,1 1,3 3,5 3,6 1,4 4,7 4,8 0,2 2,9 9,11 9,12 2,10 10,13 10,14 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.

A223442

4-level binary fanout graph coloring a rectangular array: number of n X 1 0..14 arrays where 0..14 label nodes of a graph with edges 0,1 1,3 3,5 3,6 1,4 4,7 4,8 0,2 2,9 9,11 9,12 2,10 10,13 10,14 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.

Terms

    a(0) =15a(1) =28a(2) =66a(3) =144a(4) =336a(5) =752a(6) =1752a(7) =3936a(8) =9168a(9) =20608a(10) =48000a(11) =107904a(12) =251328a(13) =564992a(14) =1315968a(15) =2958336a(16) =6890496a(17) =15490048a(18) =36079104a(19) =81106944a(20) =188912640a(21) =424681472a(22) =989159424a(23) =2223661056a(24) =5179305984a(25) =11643240448a(26) =27119198208a(27) =60964798464

External references