11996209domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of triple descents (i.e., ddd's) in all paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1),U=(1,2), or d=(1,-1).at n=6A108444Prime numbersat n=787842