34594560

Appears in sequences

• a(n) = (n+2) * (2n+1) * (2n-1)! / (n-1)!.at n=6A002691
• Expansion of e.g.f. 1 - x - sqrt(1-4*x).at n=8A052718
• Triangular array for David G. Cantor's sigma function.at n=51A055068
• Third column of triangle A062138 (generalized a=5 Laguerre).at n=6A062149
• a(1) = 1, a(n) = a(n-1) times smallest prime factor of n.at n=15A072486
• a(n) is the minimal product of the smallest prime factor of each composite number in a prime gap of 2n.at n=7A096317
• Magic products of 6 X 6 multiplicative magic squares.at n=7A113026
• Triangle of unsigned 3-Lah numbers.at n=38A143498
• a(n) = 2*(2*n)!/n!.at n=7A151817
• Series reversion of (1 - t*x)*log(1 + x) with respect to x.at n=34A198204
• a(n) = v(n+1)/v(n), where v=A203527.at n=5A203528
• Denominators of poly-Cauchy numbers of the second kind hat c_n^(2).at n=15A219247
• Denominators of poly-Cauchy numbers c_n^(2).at n=15A224094
• Numbers disqualified from being in A019505 for not being the smallest number with their respective number of divisors.at n=7A241813
• Number of weeks in n! seconds, for n >= 10.at n=6A267141
• Triangle read by rows, coefficients of the polynomials P(n,x) = (-1)^n*hypergeom( [n,-n], [], x), powers in descending order.at n=38A278071
• Totients whose inverses contain two or more consecutive tetrahedral pyramidal numbers.at n=17A318988
• Triangle read by rows: T(n, k) = binomial(n, k) * Pochhammer(n, k).at n=42A370706
• Irregular triangle T(n,k) read by rows of the coefficients of Pi^(2k) in the expansion of Sum_{k>=1} (1 / (4k^2-1)^n) with denominator 2^(2n)*(n-1)!.at n=32A382784