429660
domain: N
Appears in sequences
- Numbers k such that sopfr(k) = ud(k), where sopfr = A001414 and ud = A034444.at n=7A064029
- Triangle read by rows: T(0,0) = 1, T(n,k) = Sum_{j=max(0,1-k)..n-k} (2^j)*(binomial(k+j,1+j) + binomial(k+j+1,1+j))*T(n-1,k-1+j).at n=18A085734
- T(n, k) = [x^k] (2*n)! [z^(2*n)] 1/cos(z)^x, triangle read by rows, for 0 <= k <= n.at n=25A088874
- Triangle read by rows: T(n,k) is the number of down-up permutations on [n] with k left-to-right maxima.at n=39A098906
- Eighth column of triangle A035342.at n=3A132053
- n*A027642(n).at n=30A164869
- First bisection of A164869.at n=15A164877
- Numbers with prime factorization pqrst^2u^2.at n=12A190380
- Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=31A196200
- Coefficients of the Omega polynomials of order 2, triangle T(n,k) read by rows with 0<=k<=n.at n=25A318146