31880

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 89.at n=39A031587
• a(n) is the number of different degrees in the sequence of the degrees of the irreducible representations of the symmetric group S_n, i.e., count each degree only once.at n=43A060437
• a(n) is the number of terms in the expansion of (x+y-z)*(x^2+y^2-z^2)*(x^3+y^3-z^3)*...*(x^n+y^n-z^n).at n=21A086817
• Expansion of (1/(1-x+x^2))c(x/(1-x+x^2)), c(x) the g.f. of A000108.at n=9A174107
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=33A259003
• Number of length-n 0..5 arrays with no following elements larger than the first repeated value.at n=5A267468
• T(n,k)=Number of length-n 0..k arrays with no following elements larger than the first repeated value.at n=50A267471
• Number of length-6 0..n arrays with no following elements larger than the first repeated value.at n=4A267474
• Numbers k such that Bernoulli number B_{k} has denominator 13530.at n=21A295587
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of 1/(1 - Sum_{j>=1} j^k*x^j).at n=61A320251