69766

Appears in sequences

• Expansion of Product_{m>=1} 1/(1 + m*q^m).at n=30A022693
• Number of (n+1)X(2+1) 0..3 arrays colored with the maximum plus the upper median minus the minimum of every 2X2 subblock.at n=1A236586
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the maximum plus the upper median minus the minimum of every 2X2 subblock.at n=4A236588
• G.f. A(x) satisfies: 1 - x = Sum_{n>=0} x^n * (x^(2*n) + (-1)^n*A(x))^n.at n=18A352817
• a(n) = 1 + Sum_{k=0..n-1} (k+1)^2 * a(k) * a(n-k-1).at n=5A376126