Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns in which the top entry is equal to the bottom entry (0<=k<=floor(n/2)).
A181299
Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns in which the top entry is equal to the bottom entry (0<=k<=floor(n/2)).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =1a(4) =20a(5) =4a(6) =64a(7) =17a(8) =1a(9) =206a(10) =68a(11) =6a(12) =662a(13) =261a(14) =32a(15) =1a(16) =2128a(17) =976a(18) =152a(19) =8a(20) =6840a(21) =3577a(22) =675a(23) =51a(24) =1a(25) =21986a(26) =12912a(27) =2860a(28) =280a(29) =10
External references
- oeis: A181299