Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.

A008893

Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.

Terms

    a(0) =0a(1) =8a(2) =66a(3) =258a(4) =710a(5) =1590a(6) =3108a(7) =5516a(8) =9108a(9) =14220a(10) =21230a(11) =30558a(12) =42666a(13) =58058a(14) =77280a(15) =100920a(16) =129608a(17) =164016a(18) =204858a(19) =252890a(20) =308910a(21) =373758a(22) =448316a(23) =533508a(24) =630300a(25) =739700a(26) =862758a(27) =1000566a(28) =1154258a(29) =1325010

External references