a(n) is the number of 5 element sets of distinct integer-sided trapezoids each of area less than 3*n^2 whose base angles are 60 degrees that fill a regular hexagon of side n units.
A390763
a(n) is the number of 5 element sets of distinct integer-sided trapezoids each of area less than 3*n^2 whose base angles are 60 degrees that fill a regular hexagon of side n units.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =6a(4) =20a(5) =50a(6) =96a(7) =168a(8) =264a(9) =396a(10) =560a(11) =770a(12) =1020a(13) =1326a(14) =1680a(15) =2100a(16) =2576a(17) =3128a(18) =3744a(19) =4446a(20) =5220a(21) =5880a(22) =7040a(23) =8096a(24) =9240a(25) =10500a(26) =11856a(27) =13338a(28) =14924a(29) =16646
External references
- oeis: A390763