Number of edges formed by sides and straight "chords" in a right triangle when each side is divided by vertices into n equal segments.

A274586

Number of edges formed by sides and straight "chords" in a right triangle when each side is divided by vertices into n equal segments.

Terms

    a(0) =3a(1) =21a(2) =132a(3) =429a(4) =1272a(5) =2826a(6) =5640a(7) =10461a(8) =17094a(9) =26847a(10) =41046a(11) =61041a(12) =84051a(13) =118974a(14) =157209a(15) =204393a(16) =264855a(17) =346524a(18) =428880a(19) =541683a(20) =654087a(21) =793611a(22) =961179a(23) =1167468a(24) =1357515a(25) =1615209a(26) =1891980a(27) =2198019a(28) =2530275a(29) =2957808

External references