20386

Appears in sequences

• a(0) = 1, a(n) = 26*n^2 + 2 for n>0.at n=28A010016
• Expansion of (1 - x)/(1 - 3*x - 2*x^2 - 2*x^3).at n=8A077839
• a(n) = S1(n,5), where S1(n,t) = Sum_{k=0..n} k^t * Sum_{j=0..k} binomial(n,j).at n=4A089662
• Number of unlabeled pentagonal 2-trees with n pentagons.at n=8A094611
• a(n) = n^3 - 2*n^2 + 2.at n=27A100109
• Number of 0..7 arrays of length n with each element differing from at least one neighbor by something other than 1, starting with 0.at n=5A221541
• Number of 0..n arrays of length 6 with each element differing from at least one neighbor by something other than 1, starting with 0.at n=6A221544
• Total sum of parts of multiplicity 3 in all partitions of n.at n=33A222731
• Number of separable partitions of n in which the number of distinct (repeatable) parts is > 5.at n=43A325720
• Array read by antidiagonals: T(n,k) is the number of unlabeled k-gonal 2-trees with n polygons, n >= 0, k >= 2.at n=74A340811