21810
domain: N
Appears in sequences
- T(2n,n), array T as in A054134.at n=6A054139
- Triangle T(n,k) of asymmetric n X n binary matrices with k=0..n^2 ones under action of dihedral group of the square D_4.at n=33A054645
- Triangle T(n,k) of asymmetric n X n binary matrices with k=0..n^2 ones under action of dihedral group of the square D_4.at n=46A054645
- Third binomial transform of binomial(n+6, 6).at n=5A081905
- a(n) = Sum_{k = 0..n} binomial(n,k) * binomial(n+1,k+1) * 4^k.at n=5A098665
- Egyptian fraction representation for the cube root of 80.at n=2A132554
- Number of Sylvester classes of 3-parking functions of length n.at n=4A243672
- Let { d_1, d_2, ..., d_k } be the divisors of n. Then a(n) = d_k^1 + d_(k-1)^2 + ... + d_1^k.at n=53A264786
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood.at n=34A270219
- Expansion of Product_{k>=1} ((1 + x^(k^2)) / (1 - x^(k^2)))^k.at n=43A291667