42550

Appears in sequences

• Stirling numbers of the first kind: s(n+2, n).at n=23A000914
• Integers that are Rhonda numbers to base 15.at n=15A100974
• G.f.: x*(1 - 2*x^2)/(1 - x - 3*x^2 - 3*x^3 - x^4).at n=13A114723
• Ordered Stirling numbers S1(n,k) >= 0.at n=32A193245
• Number of sets of 4 distinct collinear points in an n X n permutation array in which leftmost pair has same spacing as rightmost pair.at n=22A234471
• Numbers k such that nearest common ancestor of k and sigma(k) in Doudna tree (A347879) is the grandparent of k.at n=8A347392
• Numbers k such that the odd parts of sigma(k) and A064989(k) are equal, where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.at n=9A374463