73900

Appears in sequences

• Partial sums of A243980.at n=39A244050
• Number of (n+1)X(4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 1,1 2,2 -1,0 or 0,-1.at n=7A264651
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 1,1 2,2 -1,0 or 0,-1.at n=58A264655
• G.f.: Sum_{k>=0} x^(k*(k+1)) * Product_{j=1..k} ((1 + x^j)/(1 - x^j))^2.at n=32A376852