Triangle read by rows, T(n,k) = k*Sum_{m=1..n/k} t(k)*t(n-k*m+1) with t = A000081, for n>=1 and 1<=k<=n.
A275331
Triangle read by rows, T(n,k) = k*Sum_{m=1..n/k} t(k)*t(n-k*m+1) with t = A000081, for n>=1 and 1<=k<=n.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =4a(4) =2a(5) =6a(6) =8a(7) =6a(8) =6a(9) =16a(10) =17a(11) =10a(12) =12a(13) =16a(14) =45a(15) =37a(16) =24a(17) =30a(18) =32a(19) =45a(20) =120a(21) =85a(22) =50a(23) =60a(24) =64a(25) =90a(26) =120a(27) =336a(28) =200a(29) =120
External references
- oeis: A275331