Row 1 of table in A067640.
A067636
Row 1 of table in A067640.
Terms
- a(0) =2a(1) =20a(2) =210a(3) =2352a(4) =27720a(5) =339768a(6) =4294290a(7) =55621280a(8) =734959368a(9) =9873696560a(10) =134510127752
External references
- oeis: A067636
A067636
Row 1 of table in A067640.