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

A333460

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

Terms

    a(0) =8a(1) =172a(2) =1864a(3) =9396a(4) =28188a(5) =72688a(6) =153240a(7) =269680a(8) =500344a(9) =795344a(10) =1158752a(11) =1820428a(12) =2506948a(13) =3477052a(14) =4772708a(15) =6313892a(16) =8116916a(17) =10200156a(18) =13320308a(19) =16199876a(20) =20189488a(21) =24692976a(22) =28950448a(23) =36096712a(24) =41795388a(25) =49216724a(26) =58997920

External references