102830

Appears in sequences

• Theta series of A_14 lattice.at n=3A023905
• Theta series of A*_14 lattice.at n=45A023926
• Numbers <= 10^6 with valid Luhn mod 10 check digit, sorted first by check digit, then lexicographically.at n=32A249855
• Let b(n) be the number of permutations {c_1..c_n} of {1..n} for which c_1 - c_2 + ... + (-1)^(n-1)*c_n are pentagonal numbers (A000326). Then a(n) = b(n)/A010551(n).at n=22A294812
• a(n) = n*(n + 1)*(n^2 + n + 22)/24.at n=39A318054