Squarefree part of C(2n,n), the central binomial numbers: the smallest number such that a(n)*C(2n,n) is a square.
A069113
Squarefree part of C(2n,n), the central binomial numbers: the smallest number such that a(n)*C(2n,n) is a square.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =5a(4) =70a(5) =7a(6) =231a(7) =858a(8) =1430a(9) =12155a(10) =46189a(11) =176358a(12) =676039a(13) =104006a(14) =44574a(15) =1077205a(16) =66786710a(17) =64822395a(18) =90751353a(19) =353452638a(20) =3829070245a(21) =134564468610a(22) =526024740930a(23) =2287064091a(24) =35830670759a(25) =71661341518a(26) =281132955186
External references
- oeis: A069113