698027

Appears in sequences

• Gaussian binomial coefficient [n, 2] for q = 2.at n=11A006095
• Gaussian binomial coefficients [n, 9] for q = 2.at n=2A022192
• Number of sublattices of index n in generic 10-dimensional lattice.at n=3A038997
• Z(S_m; sigma[1](n), sigma[2](n),..., sigma[m](n)) where Z(S_m; x_1,x_2,...,x_m) is the cycle index of the symmetric group S_m and sigma[k](n) is the sum of k-th powers of divisors of n; m=9.at n=3A068026
• A Jacobsthal variant.at n=20A097038
• a(n) = 6*a(n-1) - 8*a(n-2) + 1 for n > 1; a(0) = 1, a(1) = 7.at n=9A171477
• Number of set partitions of [n] into exactly four blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.at n=18A274868