592020

Appears in sequences

• Alkane (or paraffin) numbers l(10,n).at n=21A018211
• Number of reversible strings with n-1 beads of 2 colors. 7 beads are black. String is not palindromic.at n=20A032094
• Eighth column of Catalan triangle A009766.at n=13A064061
• Numbers with prime factorization pqrst^2u^2.at n=28A190380
• Central terms of the triangle in A208101.at n=13A208983
• Number of North-East lattice paths from (0,0) to (n,n) that cross the diagonal y = x horizontally exactly three times.at n=7A268446
• Number of n-element subsets of [n+7] having an even sum.at n=21A282083
• a(n) = A128899(2*n, n) = 2*binomial(4*n - 1, 3*n) for n >= 1 and a(0) = 1.at n=7A359108