33395

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.at n=17A147111
• Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up.at n=2A177667
• Numerators of the partial alternating sums of the reciprocals of the sum of unitary divisors function (A034448).at n=20A379515