Irregular triangle read by rows: T(n,k) is the number of rooted binary normal unlabeled galled trees with n leaves and exactly k galls, 0 <= k <= floor((n-1)/2).
A380306
Irregular triangle read by rows: T(n,k) is the number of rooted binary normal unlabeled galled trees with n leaves and exactly k galls, 0 <= k <= floor((n-1)/2).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =3a(7) =15a(8) =2a(9) =6a(10) =48a(11) =18a(12) =11a(13) =148a(14) =107a(15) =6a(16) =23a(17) =435a(18) =528a(19) =78a(20) =46a(21) =1250a(22) =2295a(23) =661a(24) =19a(25) =98a(26) =3512a(27) =9185a(28) =4356a(29) =346
External references
- oeis: A380306