Irregular table read by rows: Take a concave circular triangle with all diagonals drawn, as in A340685. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.
A340688
Irregular table read by rows: Take a concave circular triangle with all diagonals drawn, as in A340685. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.
Terms
- a(0) =1a(1) =12a(2) =22a(3) =3a(4) =3a(5) =66a(6) =36a(7) =67a(8) =108a(9) =12a(10) =222a(11) =186a(12) =48a(13) =6a(14) =265a(15) =465a(16) =132a(17) =6a(18) =582a(19) =786a(20) =174a(21) =48a(22) =732a(23) =1905a(24) =324a(25) =76a(26) =3a(27) =6a(28) =1410a(29) =2268
External references
- oeis: A340688