37080

Appears in sequences

• Triangle T(n,k) of k-block T_0-tricoverings of an n-set, n >= 3, k = 0..2*n.at n=33A059530
• Sums of members of groups in A076063.at n=41A076066
• Sum of all matrix elements M(i,j) = (i^2)/(i+j) multiplied by (2*n)!/n!.at n=4A098612
• Coefficient of x^(2n+1) in the expansion of (1+x+x^2+x^3+x^4)^n.at n=8A104631
• Antidiagonal sums of the convolution array A213778.at n=28A213780
• Numbers n such that n^2 + 1, (n+1)^2 + 1 and (n+2)^2 + 1 are divisible by a square.at n=7A218048
• a(n) = smallest k such that prime(n) is the n-th largest divisor of k.at n=26A226326
• Irregular triangle read by rows: T(n,k) = number of k-irredundant sets in the n X n rook graph.at n=26A290823
• E.g.f. C(x,y) = 1 + Integral S(x,y)*C(y,x) dx such that C(x,y)^2 - S(x,y)^2 = 1 and C(y,x) = Integral S(y,x)*C(x,y) dy, where C(x,y) = Sum_{n>=0} Sum_{k=0..n} T(n,k) * x^(2*n-2*k)*y^(2*k)/(2*n)!, as a triangle of coefficients T(n,k) read by rows.at n=16A322731
• E.g.f. C(y,x) = 1 + Integral S(y,x)*C(x,y) dy such that C(x,y)^2 - S(x,y)^2 = 1 and C(x,y) = Integral S(x,y)*C(y,x) dx, where C(y,x) = Sum_{n>=0} Sum_{k=0..n} T(n,k) * x^(2*n-2*k)*y^(2*k)/(2*n)!, as a triangle of coefficients T(n,k) read by rows.at n=19A322732
• Number of multiset partitions of integer partitions of n such that all blocks are gapless.at n=18A356941