The number of regions inside a diagonal-edged (or diamond-shaped) checkerboard of width and height 2*n-1 formed by the straight line segments mutually connecting any two of the 8*n-4 vertices on the perimeter.

A333434

The number of regions inside a diagonal-edged (or diamond-shaped) checkerboard of width and height 2*n-1 formed by the straight line segments mutually connecting any two of the 8*n-4 vertices on the perimeter.

Terms

    a(0) =4a(1) =104a(2) =1080a(3) =5220a(4) =15508a(5) =39088a(6) =81464a(7) =144292a(8) =261544a(9) =415552a(10) =610460a(11) =942032a(12) =1303848a(13) =1803360a(14) =2461232a(15) =3250284a(16) =4182552a(17) =5269080a(18) =6818764a(19) =8326188a(20) =10336548a(21) =12621292a(22) =14882600a(23) =18368708a(24) =21377496a(25) =25168908a(26) =29994204

External references