81237

Appears in sequences

• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.at n=15A146877
• Least k such that n <= Sum_{i=1..k} 1/A258252(i), where A258252 are the numbers having lowest possible denominators for the sums of reciprocals.at n=9A258255