102440

Appears in sequences

• Number of 3-element ordered antichains on an unlabeled n-element set; T_1-hypergraphs with 3 labeled nodes and n hyperedges.at n=15A056005
• a(n) = 256*n^2 + 2*n.at n=19A158230
• a(n) = 1600*n^2 + 40.at n=7A158775
• a(n) = Pell(n)*A000118(n) for n>=1 with a(0)=1, where A000118(n) is the number of ways of writing n as a sum of 4 squares.at n=9A209443