a(n) = denominator of b(n), where b(1) = 1, b(n+1) = Sum_{k=1..n} b(k)^((-1)^(n-k+1)).
A115602
a(n) = denominator of b(n), where b(1) = 1, b(n+1) = Sum_{k=1..n} b(k)^((-1)^(n-k+1)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =22a(6) =115a(7) =1034a(8) =10925a(9) =197494a(10) =4184275a(11) =151477898a(12) =6422862125a(13) =465188624758
External references
- oeis: A115602