57873

Appears in sequences

• An alternating 2-based sum from prime(n) up to the base of the n-th Mersenne prime.at n=25A162848
• Numerator of (1/3)*(Product_{j=0..n-1} (((2*j+1)*(3*j+4))/((j+1)*(6*j+1))) - 1).at n=9A271923
• Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most three elements and for at least one block c the smallest integer interval containing c has exactly three elements.at n=13A320553