Triangle read by rows: T(n,k) (0 <= k <= n) = number of elements of alternating semigroup A_n of height k.
A283321
Triangle read by rows: T(n,k) (0 <= k <= n) = number of elements of alternating semigroup A_n of height k.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =9a(8) =9a(9) =3a(10) =1a(11) =16a(12) =72a(13) =48a(14) =12a(15) =1a(16) =25a(17) =200a(18) =600a(19) =300a(20) =60a(21) =1a(22) =36a(23) =450a(24) =2400a(25) =5400a(26) =2160a(27) =360a(28) =1a(29) =49
External references
- oeis: A283321