27490

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 69.at n=27A020408
• Floor((n-1)!/[n(n+1)]).at n=10A143357
• Number of (7+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.at n=11A253704
• Number of 4 X n binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.at n=32A266937
• Number of compositions of 6*n-2 into parts 5 and 6.at n=15A373962
• a(n) = Sum_{k=0..floor(3*n/5)} binomial(k+2,3*n-5*k).at n=28A390034
• Expansion of 1 / ((1-x)^5 - x^6).at n=14A390045
• a(n) = Sum_{k=0..floor(2*n/5)} binomial(k,2*n-5*k).at n=47A391265