a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4, with initial terms 1,2,1.
A025263
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4, with initial terms 1,2,1.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =6a(4) =16a(5) =57a(6) =190a(7) =676a(8) =2418a(9) =8860a(10) =32848a(11) =123413a(12) =468246a(13) =1792700a(14) =6915438a(15) =26856116a(16) =104908160a(17) =411944698a(18) =1625120364a(19) =6437911432a(20) =25600033700a(21) =102145852536a(22) =408840420704
External references
- oeis: A025263