Number of equilateral triangles formed out of matches that can be found in a hexagonal chunk of side length n in hexagonal array of matchsticks.

A045949

Number of equilateral triangles formed out of matches that can be found in a hexagonal chunk of side length n in hexagonal array of matchsticks.

Terms

    a(0) =0a(1) =6a(2) =38a(3) =116a(4) =262a(5) =496a(6) =840a(7) =1314a(8) =1940a(9) =2738a(10) =3730a(11) =4936a(12) =6378a(13) =8076a(14) =10052a(15) =12326a(16) =14920a(17) =17854a(18) =21150a(19) =24828a(20) =28910a(21) =33416a(22) =38368a(23) =43786a(24) =49692a(25) =56106a(26) =63050a(27) =70544a(28) =78610a(29) =87268

External references