152880

Appears in sequences

• Number of labeled n-vertex dissections of a ball.at n=5A001762
• The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)*binomial(n-1, k-1)*( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.at n=39A156786
• The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)*binomial(n-1, k-1)*( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.at n=41A156786
• a(n) = sinh(2*arccosh(n))^2 = 4*n^2*(n^2 - 1).at n=14A173121
• Numbers with prime factorization pqrs^2t^4.at n=16A190384
• Triangular array read by rows: T(n,k) is the number of rooted labeled simple graphs on {1,2,...,n} such that the root is in a component of size k; n>=1, 1<=k<=n.at n=25A228315
• 6*s*t*(4*s^4 + 3*t^4), where s > 0, t = 1..s.at n=11A241923
• Number of 2 X 2 matrices with entries in {0,1,...,n} and odd determinant with no entry repeated.at n=26A279483
• Triangular array read by rows: row n shows the coefficients of this polynomial of degree n: p(x,n) = 2^(n-1) ((x+r)^n - (x+s)^n)/(r - s), where r = 2 and s = 1/2.at n=30A327317
• Triangle T(n,m) = C(2*m-1,m)*C(n+2*m-1,n-m).at n=49A338037
• Expansion of e.g.f. exp(x^3/(6 * (1 - x)^3)).at n=8A361573
• Expansion of (1/x) * Series_Reversion( x * ((1-x)^2-x)^2 ).at n=5A369509