3274425

Appears in sequences

• 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=12A013281
• tan(arcsin(x)-arctan(x))=3/3!*x^3-15/5!*x^5+945/7!*x^7-14175/9!*x^9...at n=4A013409
• Triangle T(n, k, m) = t(n,m)/( t(k,m) * t(n-k,m) ) with T(n, 0, m) = T(n, n, m) = 1, where t(n, m) = Product_{j=1..n} Product_{i=1..j-1} ( 1 - (m+1)*(i+1) ) and m = 1, read by rows.at n=23A156690
• Triangle T(n, k, m) = t(n,m)/( t(k,m) * t(n-k,m) ) with T(n, 0, m) = T(n, n, m) = 1, where t(n, m) = Product_{j=1..n} Product_{i=1..j-1} ( 1 - (m+1)*(i+1) ) and m = 1, read by rows.at n=25A156690
• a(n) = Product_{k=0..n} ((4*k+1)*(4*k+3))^(n-k).at n=3A168440
• a(n) = sqrt(Pi/4)*2^A048881(2*n)*L(2*n) where L(s) = lim_{t->s} (t/2)!/((1-t)/2)!.at n=7A333306
• Odd coreful abundant numbers: the odd terms of A308053.at n=28A339936
• Indices at which A358777 attains a new value.at n=30A359608
• Partial products of A006257.at n=12A375959