170080domain: NAppears in sequencesG.f. satisfies: A(x) = 1 + x*( d/dx x*A(x) )^5.at n=5A211826Number of edges formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).at n=24A331765