Number of obtuse isosceles triangles on a centered hexagonal grid of size n.

A241230

Number of obtuse isosceles triangles on a centered hexagonal grid of size n.

Terms

    a(0) =0a(1) =12a(2) =108a(3) =528a(4) =1674a(5) =4104a(6) =8622a(7) =16206a(8) =28332a(9) =46200a(10) =71484a(11) =106746a(12) =153552a(13) =214860a(14) =293166a(15) =391470a(16) =512592a(17) =660546a(18) =840840a(19) =1054704a(20) =1308696a(21) =1606776

External references