a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 2,1,1,1.
A025269
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 2,1,1,1.
Terms
- a(0) =2a(1) =1a(2) =1a(3) =1a(4) =6a(5) =27a(6) =122a(7) =555a(8) =2530a(9) =11564a(10) =52994a(11) =243467a(12) =1121292a(13) =5176432a(14) =23952042a(15) =111076279a(16) =516217844a(17) =2404051080a(18) =11218106730a(19) =52447788512a(20) =245659502752
External references
- oeis: A025269