Triangle read by rows: Take a hexagon with all diagonals drawn, as in A331931. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+4.
A331932
Triangle read by rows: Take a hexagon with all diagonals drawn, as in A331931. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+4.
Terms
- a(0) =18a(1) =6a(2) =0a(3) =264a(4) =108a(5) =36a(6) =0a(7) =1344a(8) =654a(9) =252a(10) =12a(11) =6a(12) =4164a(13) =2772a(14) =1020a(15) =228a(16) =24a(17) =0a(18) =10038a(19) =7758a(20) =2424a(21) =516a(22) =72a(23) =24a(24) =0a(25) =21108a(26) =16188a(27) =6060a(28) =1128a(29) =156
External references
- oeis: A331932