130242domain: NAppears in sequencesNumber of points of L1 norm 4 in cubic lattice Z^n.at n=21A035598Coordination sequence for 21-dimensional cubic lattice.at n=4A035716Coordination sequence for C_21 lattice.at n=2A035758Number of nodes in virtual, "optimal", chordal graphs of diameter 4 and degree n+1.at n=39A067956