a(n) is the frequency of multi-pairs in a sequence of multi-set designs with 2 blocks.
A335649
a(n) is the frequency of multi-pairs in a sequence of multi-set designs with 2 blocks.
Terms
- a(0) =0a(1) =10a(2) =200a(3) =3040a(4) =43320a(5) =607050a(6) =8468880a(7) =118007680a(8) =1643826800a(9) =22896269770a(10) =318906570840
External references
- oeis: A335649