128988

Appears in sequences

• a(1)=1, a(2)=2, then use "merge and minus": a(n)=merge(a(1),...,a(n-1))-a(1)-...-a(n-1).at n=4A075538
• Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=3A237069
• Number of (n+1)X(4+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=0A237072
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=6A237076
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median of every 2X2 subblock equal.at n=9A237076
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(2*n-2*k-2,n-2*k).at n=11A390683