289800

Appears in sequences

• Expansion of e.g.f. tanh(log(x+1) - arctan(x)).at n=10A013253
• Exponential transform of Pascal's triangle A007318.at n=40A055883
• Total number of edges in all trees on n nodes.at n=15A095349
• a(n) = (n^8 - 60*n^6 + 90*n^5 + 1160*n^4 - 3204*n^3 - 5349*n^2 + 26586*n - 23760)/24.at n=5A135923
• a(n) is the Severi degree for curves of degree n and cogenus 2.at n=16A171108
• Numbers with prime factorization pqr^2s^2t^3.at n=9A190386
• Numbers n having a proper divisor d such that sigma(n) - k*d = k*n. Case k = 4.at n=26A291458
• Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).at n=21A307114
• Primitive terms of A023198: numbers k with the property sigma(k)/k >= 4 that are not divisible by any other number with that property.at n=23A392936