224843

Appears in sequences

• A simple grammar.at n=12A052890
• Triangle T(n,k) by rows: T(n, k) = (n-k+1)*T(n-1, k-1) + k*T(n-1, k) + T(n-2, k-1) with T(n, 1) = T(n, n) = 1.at n=40A144438
• Number of (n+1)X(n+1) 0..7 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=1A204783
• Number of (n+1)X3 0..7 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=1A204785
• T(n,k)=Number of (n+1)X(k+1) 0..7 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=4A204791