Number of unrooted planar 4-constellations with n quadrangles.

A090373

Number of unrooted planar 4-constellations with n quadrangles.

Terms

    a(0) =1a(1) =10a(2) =60a(3) =875a(4) =14600a(5) =303814a(6) =6846180a(7) =165740155a(8) =4221248540a(9) =112001557620

External references