31507

Appears in sequences

• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.at n=16A147017
• Number of nodes (or order) of a graph model obtained using an automata scheme on sets of order prime(n) >= 5 and in which all not halt states are linked by arcs (edges).at n=38A160772
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UU, HH, DU and DD.at n=28A329690
• Starts of runs of 3 consecutive numbers that have an equal number of even and odd exponents in their prime factorization (A187039).at n=14A348077
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=27A348099