19574

Appears in sequences

• Number of asymmetrical planar partitions of n: planar partitions (A000219) that when regarded as 3-D objects have no symmetry.at n=20A000785
• Cluster series for cubic lattice.at n=7A003211
• Erdős-Selfridge function: a(n) is the least number m > n+1 such that the least prime factor of binomial(m, n) is > n.at n=21A003458
• McKay-Thompson series of class 40C for Monster.at n=51A058664
• This is to A139025 as A139025 to A014688, see A139025 for details.at n=32A139026
• a(n) = 529*n + 1.at n=36A158368
• The maximum possible number of rooted triples consistent with any galled-tree (level-1 phylogenetic network) containing exactly n leaves.at n=44A216499
• Number of compositions of n with exactly 5 transitions between different parts.at n=8A244717
• Semiprimes sp such that sp plus its digit sum is a perfect square.at n=21A244733
• Number of length n+1 0..2*7 arrays with the sum of the absolute values of adjacent differences equal to n*7.at n=3A249981
• T(n,k) is the number of length n+1 0..2*k arrays with the sum of the absolute values of adjacent differences equal to n*k.at n=48A249982
• Number of length 4+1 0..2*n arrays with the sum of the absolute values of adjacent differences equal to 4*n.at n=6A249984
• Antidiagonal sums of A321396.at n=20A321395
• E.g.f.: (1 + sinh(x)) / (1 - sinh(x)).at n=7A322623
• a(n) = Sum_{k=1..n-1} sigma(k) * sigma_2(n-k).at n=18A374974