Number of vertices in an diagonal-edged (or diamond-shaped) checkerboard with width and height 2*n-1 (see Comments in A333434 for definition).

A333459

Number of vertices in an diagonal-edged (or diamond-shaped) checkerboard with width and height 2*n-1 (see Comments in A333434 for definition).

Terms

    a(0) =5a(1) =69a(2) =785a(3) =4177a(4) =12681a(5) =33601a(6) =71777a(7) =125389a(8) =238801a(9) =379793a(10) =548293a(11) =878397a(12) =1203101a(13) =1673693a(14) =2311477a(15) =3063609a(16) =3934365a(17) =4931077a(18) =6501545a(19) =7873689a(20) =9852941a(21) =12071685a(22) =14067849a(23) =17728005a(24) =20417893a(25) =24047817a(26) =29003717

External references