Number of triangles that can be built from rods with lengths 1,2,...,n by using and concatenating not necessarily all rods.

A160456

Number of triangles that can be built from rods with lengths 1,2,...,n by using and concatenating not necessarily all rods.

Terms

    a(0) =0a(1) =3a(2) =20a(3) =70a(4) =172a(5) =366a(6) =709a(7) =1274a(8) =2166a(9) =3537a(10) =5573a(11) =8494a(12) =12588a(13) =18227a(14) =25846a(15) =35942a(16) =49124a(17) =66138a(18) =87827a(19) =115132a(20) =149166a(21) =191238a(22) =242800a(23) =305447a(24) =381012a(25) =471602a(26) =579518a(27) =707254a(28) =857627a(29) =1033812

External references