31135104000
domain: N
Appears in sequences
- E.g.f. 1/((1-x)(1-x^3)).at n=13A052569
- E.g.f. (1-x)/(1-x-x^5).at n=13A052627
- Expansion of e.g.f. (2-x-2*x^2)/((1-x)*(1-2*x^2)).at n=12A052636
- Expansion of e.g.f. 5*x/(1-x).at n=13A052648
- Expansion of e.g.f. x/((1-x)*(1-x^3)).at n=13A052688
- Ratio of (2*n-1)! to number of zeros in lower part of Sylvester matrix for polynomial of degree n with all nonzero coefficients.at n=5A138898
- a(n) = (2*n+1)!*(2*n+3)/3.at n=6A165457
- Number of relaxed compacted binary trees of right height at most one with minimal sequences between branch nodes except after the last branch node on level 0.at n=13A288953
- E.g.f.: Product_{m>0} (1 + x^(2*m-1) + x^(4*m-2)/2! + x^(6*m-3)/3!).at n=13A293489
- a(n) = n! * Sum_{k=1..n} k/floor(n/k).at n=11A345684
- Expansion of e.g.f. (1/x) * Series_Reversion( x/(1 + (exp(x^2) - 1)^2/x) ).at n=12A392891