137610

Appears in sequences

• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives y numbers.at n=25A125491
• The number of ways of putting n labeled items into k labeled boxes so that each box receives at least 2 objects.at n=27A200091
• Number of doubly-surjective functions f:[n]->[3].at n=5A224541