19189

Appears in sequences

• Expansion of Product_{k>=0} 1/(1 - x^(k+1))^A001156(k).at n=27A045842
• a(n) = T(p(n)) - p(T(n)) = Commutator[triangular numbers, primes] at n.at n=53A123907
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation.at n=15A146385
• Number of unique X-rays of n X n binary matrices with exactly n ones.at n=31A290133