1091475

Appears in sequences

• Expansion of e.g.f.: exp(arcsinh(x)+log(x+1))=1+2*x+3/2!*x^2+3/3!*x^3-3/4!*x^4-15/5!*x^5...at n=11A013069
• Expansion of e.g.f.: sech(log(x+1)-arcsinh(x))=1-3/4!*x^4+30/5!*x^5-180/6!*x^6+945/7!*x^7...at n=11A013281
• Expansion of e.g.f. theta_3^(3/2).at n=9A015665
• Denominators q[ n ] of convergents to Stern's non-simple continued fraction for Pi/2.at n=9A046126
• a(n) is the least integer that can be expressed as the difference of two hexagonal numbers in exactly n ways.at n=20A334035
• Odd coreful abundant numbers: the odd terms of A308053.at n=8A339936
• Smallest number having exactly n divisors of the form 8*k + 1.at n=24A343104
• Smallest number having exactly n divisors of the form 8*k + 3.at n=25A343105
• Positions of records in A188169.at n=14A343134
• Positions of records in A188170.at n=14A343135
• Odd numbers k such that A187795(k) > 2*k.at n=26A347936
• Odd noninfinitary abundant numbers: the odd terms of A348274.at n=1A348275
• Triangle T(n, k) read by rows: T(n, k) = 2^n*binomial(2*n + 1, 2*k + 1) * Pochhammer(1/2, n - k) * Pochhammer(1/2, k).at n=34A380281
• a(n) = (-1)^n*Product_{k=1..n} (2*k + 1)*(2*k - 3).at n=5A380612