Number of triangles larger than size=1 in a matchstick-made hexagon with side length n.

Terms

a(0) =0a(1) =0a(2) =14a(3) =62a(4) =166a(5) =346a(6) =624a(7) =1020a(8) =1556a(9) =2252a(10) =3130a(11) =4210a(12) =5514a(13) =7062a(14) =8876a(15) =10976a(16) =13384a(17) =16120a(18) =19206a(19) =22662a(20) =26510a(21) =30770a(22) =35464a(23) =40612a(24) =46236a(25) =52356a(26) =58994a(27) =66170a(28) =73906a(29) =82222