Triangle T(n, k) read by rows giving number of non-equivalent ways to choose k points in an equilateral triangle grid of side n.

A231655

Triangle T(n, k) read by rows giving number of non-equivalent ways to choose k points in an equilateral triangle grid of side n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =4a(9) =6a(10) =4a(11) =2a(12) =1a(13) =1a(14) =3a(15) =10a(16) =25a(17) =41a(18) =48a(19) =41a(20) =25a(21) =10a(22) =3a(23) =1a(24) =1a(25) =4a(26) =22a(27) =87a(28) =244a(29) =526

External references