Number of pairs of sequences of cardinality at least 3.
A052521
Number of pairs of sequences of cardinality at least 3.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =720a(7) =10080a(8) =120960a(9) =1451520a(10) =18144000a(11) =239500800a(12) =3353011200a(13) =49816166400a(14) =784604620800
External references
- oeis: A052521