6564120420
domain: N
Appears in sequences
- Expansion of (sqrt(1-4x^2) - sqrt(1-4x))/(2x).at n=20A000912
- Catalan numbers with even index (A000108(2*n), n >= 0): a(n) = binomial(4*n, 2*n)/(2*n+1).at n=10A048990
- Quotient C[p(n),{p(n)+-1}/2]/p(n), where p(n)=n-th prime.at n=11A075891
- Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A089851/A089853.at n=21A089848
- Carlitz-Riordan q-Catalan numbers (recurrence version) for q = -1.at n=41A090192
- Expansion of 1 + 2x/(1 + sqrt(1 - 4x^2)).at n=41A097331
- G.f. is 1 + x*c(x), where c(x) is the g.f. of the Catalan numbers (A000108).at n=21A120588
- Catalan numbers (A000108) interpolated with 0's.at n=40A126120
- The matrix-vector product A133080 * A000108.at n=20A133602
- Even Catalan numbers.at n=15A152670
- a(n) = (-1)^n*Catalan(n).at n=20A168491
- First terms of first rows of zigzag matrices as defined in A088961.at n=18A230585
- Expansion of g.f.: Catalan(x)/Catalan(-x).at n=20A349648
- Expansion of g.f. A(x) satisfying A( A(x) - C(x) ) = x^2, where C(x) = x + C(x)^2 is the Catalan function (A000108).at n=20A373310
- Catalan numbersat n=20