81466

Appears in sequences

• Number of reversible strings with n-1 beads of 2 colors. 4 beads are black. String is not palindromic.at n=41A032091
• a(n) = (n+1)*(n+2)*(n+3)*(9n+4)/24.at n=20A051798
• Larger members of primitive phi-amicable pairs.at n=25A121249
• Number of n-element subsets of [n+4] having an even sum.at n=42A282080
• Number of 3-cycles in the n X n rook graph.at n=22A288961
• Numbers k that divide the k-th Domb number.at n=42A372941