26050

Appears in sequences

• a(n) = (5*n + 1)^2 + 4*n + 1.at n=32A007533
• a(n) = 25*n^2 - 36*n + 13.at n=33A154355
• a(n) = (n^3 - 2*n^2 + 3*n + 2)/2.at n=38A189890
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=18A192761
• Number of nX3 0..1 arrays with row sums nondecreasing and column sums unimodal.at n=6A223621
• T(n,k)=Number of nXk 0..1 arrays with row sums nondecreasing and column sums unimodal.at n=42A223625
• Numbers m such that m^2+1 is prime with (m-1)^2+1 and (m+1)^2+1 semiprimes.at n=40A321795