Triangle read by rows: T(n,k) = T(n-k,k-1) + 2*T(n-k,k) + T(n-k,k+1) with T(0,0) = 1 for 0 <= k <= A003056(n).
A291929
Triangle read by rows: T(n,k) = T(n-k,k-1) + 2*T(n-k,k) + T(n-k,k+1) with T(0,0) = 1 for 0 <= k <= A003056(n).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =0a(6) =4a(7) =1a(8) =0a(9) =9a(10) =2a(11) =0a(12) =20a(13) =6a(14) =0a(15) =46a(16) =13a(17) =1a(18) =0a(19) =105a(20) =32a(21) =2a(22) =0a(23) =242a(24) =73a(25) =6a(26) =0a(27) =557a(28) =171a(29) =15
External references
- oeis: A291929