Number of ways to arrange 4 points on an n X n X n triangular grid on an isosceles triangle so that it balances at the midpoint of its central altitude.

A194021

Number of ways to arrange 4 points on an n X n X n triangular grid on an isosceles triangle so that it balances at the midpoint of its central altitude.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =8a(4) =26a(5) =75a(6) =182a(7) =387a(8) =756a(9) =1382a(10) =2379a(11) =3915a(12) =6198a(13) =9486a(14) =14110a(15) =20475a(16) =29054a(17) =40437a(18) =55309a(19) =74466a(20) =98850a(21) =129548a(22) =167784a(23) =214986a(24) =272758a(25) =342900a(26) =427453a(27) =528698a(28) =649148a(29) =791631

External references