30440
domain: N
Appears in sequences
- Number of collinear triples in a 3 X n rectangular grid.at n=40A057566
- Sum of the first n twin prime pairs.at n=37A086169
- Quotients associated with A097982.at n=24A098024
- Triangle read by rows: T(n,k) (0 <= k <= ceiling(n/2)-1) is the number of (1,0) steps at level k in all peakless Motzkin paths of length n (can be easily translated into RNA secondary structure terminology).at n=50A110237
- Number of nX4 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=6A207657
- T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=51A207661
- Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=3A207665
- The least common multiple of 1+n and 1+n^2.at n=39A281660
- a(n) = n*(2*(n - 2)*n + (-1)^n + 3)/4.at n=40A323724