418950domain: NAppears in sequencesColumn 2 of triangle A173220.at n=4A173223Triangle read by rows: the x = 1+q Narayana triangle at m=2.at n=31A243660Numbers k >= 1 such that A000217(k) divided by A018804(k) is an integer.at n=27A349724The Geode Bi-Tri infinite rectangular array, read by upward antidiagonals.at n=32A383453