93632domain: NAppears in sequences4th-order Patalan numbers (generalization of Catalan numbers).at n=6A025749A convolution triangle of numbers obtained from A025749.at n=15A049213Numbers k such that k and k+1 have the same sum of squarefree divisors, or sqf(k) = sqf(k+1), where sqf(k) = A048250(k).at n=27A063964