41043

Appears in sequences

• Number of polyarcs with n cells.at n=7A057787
• A060448 sorted and duplicates removed.at n=30A060636
• Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.at n=30A227265
• Number of ternary trees with n internal nodes labeled 1 or 2; nodes labeled 1 have three linearly ordered children, but nodes labeled 2 have three children which are reversible (the first and third children may be transposed but the middle child must remain in place).at n=6A391194