605520
domain: N
Appears in sequences
- a(n) = Sum_{i+j+k=n, 0<=i<=j<=k<=n} (n+2*i)!/((2*i)! * j! * k!).at n=5A092470
- a(n) = A068875(n-1) - A003239(n).at n=15A106520
- Coefficients in expansion of Eisenstein series -q*(d/dq)(q*(d/dq)E_2).at n=29A282154
- If the decimal expansion of n is d_1 ... d_k, a(n) = Sum d_i!*binomial(10,d_i).at n=37A306958
- Expansion of e.g.f. -log(1 - x / (1 - x)^2).at n=7A328055
- Triangle read by rows: T(n, k) = n! * 4^k * hypergeom([-k], [-n], -1/4).at n=38A375612