18261468225
domain: N
Appears in sequences
- Number of permutations in the symmetric group S_n that have odd order.at n=14A000246
- Squares of double factorials: (1*3*5*...*(2n-1))^2 = ((2*n-1)!!)^2.at n=7A001818
- Triangle of central factorial numbers |4^k t(2n+1,2n+1-2k)| read by rows (n>=0, k=0..n).at n=35A008956
- Expansion of e.g.f. exp(arcsinh(arcsin(x))).at n=15A012248
- Exponential (binomial) convolution of A001818 (with interspersed zeros) and A000142 (factorials).at n=12A111601
- Table of the number of (n,k)-Riordan complexes, read by rows.at n=28A160563
- Expansion of e.g.f. arcsin(x).at n=14A177145
- a(n) = n^2*(n-2)^2*(n-4)^2*...*(1 or 2)^2.at n=13A184877
- Number of permutations on [n] admitting an eighth root.at n=14A247006
- Triangle read by rows, T(n,k) = Sum_{j=k..n} A269940(n,j)*A269939(j,k), for n>=0 and 0<=k<=n.at n=35A269957
- Numerators of bivariate Taylor expansion of the incomplete elliptic integral of the first kind.at n=35A272102
- E.g.f. A(x,k) satisfies: sn(A(x,k), k) = k * sn(x,k), where sn(,) and cn(,) are Jacobi Elliptic functions.at n=63A291527
- E.g.f. A(x,k) satisfies: sin(A(x,k)) = k * sin(x).at n=35A291560
- Number of maximal matchings in the n-barbell graph.at n=12A297470
- Numerator coefficients of the bivariate Maclaurin series ("inverse Kepler equation") developed as Lagrange inversion E=KeplerInv(e,M) of Kepler's equation M = Kepler(e,E) = E - e*sin(E).at n=27A306557