26276

Appears in sequences

• Sum of the first n twin prime pairs.at n=35A086169
• Let A denote the sequence; then A is equal to the union of the self-convolutions A^2 and A^4, with terms in ascending order by size, where a(0)=1.at n=28A090847
• Number of rooted plane trees of total weight n whose nodes are themselves planted plane trees whose roots are distinguished as either red or blue, the weight of each such node being equal to the size of the corresponding planted tree.at n=9A168506
• Number of paths from (0,0) to (n,n) using only steps North, Northeast and East (i.e., steps E(1,0), D(1,1), and N(0,1)) that do not cross y=x "vertically".at n=7A268208
• Number of compositions (ordered partitions) of n into nonprime squarefree parts (A000469).at n=38A290137
• Number of partitions of n with rank a multiple of 4.at n=45A363233