33976

Appears in sequences

• Numerator of Sum_{k=0..n} (-1)^k/(2*k+1).at n=7A007509
• Erroneous version of A002538.at n=5A047867
• 75-gonal numbers: a(n) = n*(73*n-71)/2.at n=31A098230
• a(n) = Sum_{k=0..floor(n/2)} C(n-k,k+2)*3^(n-k-2)*(4/3)^k.at n=8A099624
• Number of nX7 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically.at n=4A207884
• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically.at n=6A207887
• a(n) = Sum_{k=0..n} k*A000009(k).at n=28A270105
• a(n) = 4*(n+1)*(9*n+4).at n=30A304505