-1697

Appears in sequences

• Matrix inverse of triangle A101275 (number of Schröder paths).at n=28A102051
• Diagonal sums of Riordan array (1-x-x^2,x(1-x)).at n=29A109266
• Expansion of -(1+x+3*x^2+x^3)/((x^2+4*x+1)*(x^2-2*x-1)).at n=5A111641
• Expansion of (x - 1)/(1 - x^2 + x^3 + x^4 - x^5).at n=68A115413
• a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(k+2,3) * floor(n/k).at n=23A366938