Arrange n^2 octagons that each have area 7 so that they leave (n-1)^2 square gaps each with area 2; a(n) is the total area of these polygons.
A086640
Arrange n^2 octagons that each have area 7 so that they leave (n-1)^2 square gaps each with area 2; a(n) is the total area of these polygons.
Terms
- a(0) =7a(1) =30a(2) =71a(3) =130a(4) =207a(5) =302a(6) =415a(7) =546a(8) =695a(9) =862a(10) =1047a(11) =1250a(12) =1471a(13) =1710a(14) =1967a(15) =2242a(16) =2535a(17) =2846a(18) =3175a(19) =3522a(20) =3887a(21) =4270a(22) =4671a(23) =5090a(24) =5527a(25) =5982a(26) =6455a(27) =6946a(28) =7455a(29) =7982
External references
- oeis: A086640