Irregular table read by rows: Take a diagonal-edged (or diamond-shaped) checkerboard with all diagonals drawn, as in A333434. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.
A333458
Irregular table read by rows: Take a diagonal-edged (or diamond-shaped) checkerboard with all diagonals drawn, as in A333434. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.
Terms
- a(0) =4a(1) =84a(2) =20a(3) =692a(4) =312a(5) =72a(6) =4a(7) =2708a(8) =2020a(9) =400a(10) =88a(11) =0a(12) =4a(13) =7876a(14) =5764a(15) =1580a(16) =264a(17) =20a(18) =4a(19) =18220a(20) =14868a(21) =4960a(22) =904a(23) =112a(24) =24a(25) =36764a(26) =30624a(27) =11224a(28) =2496a(29) =304
External references
- oeis: A333458