18634

Appears in sequences

• Number of nonisomorphic minimal triangle graphs.at n=12A000080
• a(n) = floor(n^3 / e).at n=37A032636
• Indices m such that A128646(m)-1 is prime, where A128646 = denominator of partial sums of 1/(p(i)-1).at n=58A137689
• Number of ordered 10-tuples of distinct pairwise coprime positive integers with largest element n.at n=29A186981
• Let P be a one-move "rider" with move set M={(1,2)}; a(n) is the number of non-attacking positions of two indistinguishable pieces P on an n X n board.at n=13A222308
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) / Product_{j>=1} (1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=29A281572
• a(n) is the least number such that the concatenation of all the previous terms with it is squarefree and has n prime factors. a(0)=0.at n=10A309234
• Heinz numbers of integer partitions such that the difference between the length of the minimal square containing and the maximal square contained in the Young diagram is 1.at n=38A325179