Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of edges in the resulting planar graph.

A367279

Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of edges in the resulting planar graph.

Terms

    a(0) =4a(1) =16a(2) =156a(3) =788a(4) =2880a(5) =6468a(6) =15800a(7) =27828a(8) =49936a(9) =78732a(10) =134656a(11) =173396a(12) =286676a(13) =373004a(14) =495300a(15) =659556a(16) =938328a(17) =1086108a(18) =1525216a(19) =1727060a(20) =2187912a(21) =2724272a(22) =3468932a(23) =3730780a(24) =4781740a(25) =5611000a(26) =6549252a(27) =7404820a(28) =9272476a(29) =9645308

External references