Denominators used in A090219 to compute formula for column sequences of array A078741.
A090220
Denominators used in A090219 to compute formula for column sequences of array A078741.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =10a(6) =20a(7) =70a(8) =560a(9) =1680a(10) =2800a(11) =30800a(12) =369600a(13) =800800a(14) =11211200a(15) =168168000a(16) =448448000a(17) =7623616000a(18) =137225088000a(19) =434546112000
External references
- oeis: A090220