Triangle read by rows: Take a pentagram with all diagonals drawn, as in A331906. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+2.
A331907
Triangle read by rows: Take a pentagram with all diagonals drawn, as in A331906. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+2.
Terms
- a(0) =40a(1) =0a(2) =0a(3) =590a(4) =420a(5) =80a(6) =10a(7) =2890a(8) =3030a(9) =1130a(10) =230a(11) =50a(12) =9540a(13) =10530a(14) =4290a(15) =980a(16) =190a(17) =10a(18) =22730a(19) =28390a(20) =10960a(21) =3200a(22) =550a(23) =80a(24) =20a(25) =47610a(26) =57450a(27) =23270a(28) =6530a(29) =1160
External references
- oeis: A331907