27300

Appears in sequences

• Degrees of irreducible representations of Conway group Co1.at n=6A003903
• Unitary harmonic numbers (those for which the unitary harmonic mean is an integer).at n=15A006086
• Number of nonseparable tree-rooted planar maps with n + 2 edges and 3 vertices.at n=12A006411
• a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=28A011928
• a(n) = T(2n,n), where T is the array defined in A026105.at n=7A026112
• T(n,[ n/2 ]), where T is the array defined in A026105.at n=14A026117
• Distinct even elements in 4-Pascal triangle A028275 (by row).at n=47A028282
• Even elements to right of central elements in 4-Pascal triangle A028275.at n=40A028286
• Expansion of Product_{m>=1} ((1+q^(2*m-1))/(1+q^(2*m)))^6.at n=25A029843
• T(n,4), array T as in A050186; a count of aperiodic binary words.at n=26A050189
• Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 1 skipped prime.at n=18A050768
• Number of independent components for a Weyl tensor in n dimensions.at n=21A052472
• Factorial splitting: write n! = x*y*z with x<y<z and x maximal; sequence gives value of x.at n=13A061030
• Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k.at n=24A062925
• Infinitary harmonic numbers: harmonic mean of infinitary divisors is an integer.at n=13A063947
• Number of labeled Hugenholtz diagrams with n nodes.at n=4A064732
• Integers k such that omega(k) = omega(k-1) + omega(k-2) + omega(k-3), where omega(n) is the number of distinct prime factors of n.at n=19A076252
• Convolution of Catalan and Fibonacci numbers.at n=11A090826
• Triangle read by rows: T(n, k) = binomial(2*n, k-1)*binomial(2*n-k-1, n-k)/n for n, k >= 1, and T(n, 0) = 0^n.at n=41A094385
• A002415 and A052472 interlaced.at n=46A117651