21940

Appears in sequences

• Triangle read by rows. Same rule as Aitken triangle (A011971) except T(0,0) = 1, T(1,0) = 2.at n=42A046937
• Sequence formed from rows of triangle A046937.at n=35A046938
• Interprimes which are of the form s*prime, s=20.at n=22A075295
• Triangle, read by rows, where T(n,k) = T(n,k-1) + (k+1)*T(n-1,k) for n>k>0, T(n,0)=1 and T(n,n) = T(n,n-1) for n>=0.at n=47A102316
• Triangle read by rows: coefficients of chromatic polynomials for the poset of Dyck paths ordered by inclusion.at n=21A141622
• Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.at n=5A206121
• Number of (n+1)X7 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.at n=0A206126
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.at n=15A206128
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors.at n=20A206128
• Numbers that are the sum of ten fifth powers in three or more ways.at n=1A345635
• Numbers that are the sum of ten fifth powers in exactly three ways.at n=1A346348
• Numbers k that are a substring of xPy where k=concatenation(x,y) and xPy is the number of permutations A008279(x,y).at n=42A359012