342720

Appears in sequences

• Number of labeled rooted polygonal cacti (Husimi graphs) with n nodes.at n=7A035087
• Number of labeled 3-node T_0-hypergraphs with n hyperedges (empty hyperedges and multiple hyperedges included).at n=17A059585
• a(n) is the denominator of the coefficient of z^(2n-1) in the Maclaurin expansion of Sqrt[Pi]Erfi[z].at n=8A084253
• Triangle generated by e.g.f.: A(x,y) = exp(x + y*(x^2+x^3)), read by rows of length [n/2+1].at n=28A118588
• Successively better denominators for estimating base 10 logs of 2, 3, 4, 5, 6, 7, 8 and 9. "Better" is defined by the RMS error of the best numerators for each given denominator.at n=16A119256
• Number of permutations of 2..n+1 with all sums of 2 through 2 adjacent terms squared respectively unique.at n=8A147741
• Number of permutations of floor(i*5/3), i=0..n-1, with all sums of 7 adjacent terms unique.at n=8A152632
• Number of permutations of floor(i*8/3), i=0..n-1, with all sums of 7 adjacent terms unique.at n=8A152640
• Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down.at n=9A177531
• Bi-unitary multiperfect numbers.at n=10A189000
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<3z.at n=27A212512
• 10-quantum transitions in systems of N >= 10 spin 1/2 particles, in columns by combination indices.at n=23A213352
• Highly composite numbers of class 3 (see comment in A275239).at n=27A275241
• Bi-unitary harmonic numbers.at n=35A286325
• Number of minimum dominating sets in the n X n black bishop graph.at n=15A323500
• Number of minimum dominating sets in the n X n white bishop graph.at n=14A323501
• Triangular array read by rows: row n shows the coefficients of this polynomial of degree n: p(x,n) = 2^(n-1) ((x+r)^n - (x+s)^n)/(r - s), where r = 2 and s = 1/2.at n=41A327317
• Triangle T(n,k) read by rows: connected topologies of the effective potential in Goldstone diagrams with n interactions and k external potentials.at n=33A328924
• Triangular array read by rows. T(n,k) is the number of partial functions on [n] with index k, n=0 implies k=1, otherwise n >= 1, 1 <= k <= n.at n=35A341093
• Bi-unitary arithmetic numbers k whose mean bi-unitary divisor is a bi-unitary divisor of k.at n=22A361787