31478

Appears in sequences

• Number of prime parts in the last section of the set of partitions of n.at n=39A144120
• Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=27A296025
• Expansion of (1/(1 - x))*Sum_{k>=0} k!*x^(k*(k+1)/2)/Product_{j=1..k} (1 - x^j).at n=25A303664
• Number of set-systems (finite sets of finite nonempty sets) with union {1,2,...,n} and intersection {}.at n=4A318128