63750

Appears in sequences

• Even pentagonal pyramidal numbers.at n=37A015224
• a(n) = 4n^3 + 2n^2.at n=24A089207
• Number of rooted unicursal n-edge maps in the plane (planar with a distinguished outside face).at n=5A103944
• Triangle, read by rows, where row n lists the coefficients of x^k, k=1..2^n, in the n-th iteration of (x + x^2) for n>=0.at n=42A122888
• Minimal covering numbers.at n=37A160559
• a(n) = (n+6)*(n+1)*(n^2 + 7*n + 16)/4.at n=20A168538
• Triangle (read by rows) of coefficients of the polynomials (in ascending order) of the denominators of the generalized sequence of fractions f(n) defined recursively by f(1) = m/1; f(n+1) is chosen so that the sum and the product of the first n terms of the sequence are equal.at n=57A225200
• Numbers k such that sum(d|k, sigma(d)^2) is a multiple of k.at n=9A226563
• T(n,k)=Number of length n+4 0..k arrays with some pair in every consecutive five terms totalling exactly k.at n=36A246892
• Number of length 1+4 0..n arrays with some pair in every consecutive five terms totalling exactly n.at n=8A246893
• Pentagonal pyramidal numbers divisible by 3.at n=33A299412
• a(n) = A328613(A276086(n)).at n=27A328763