a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4, starting 2,1,1.
A025264
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4, starting 2,1,1.
Terms
- a(0) =2a(1) =1a(2) =1a(3) =5a(4) =22a(5) =99a(6) =450a(7) =2067a(8) =9586a(9) =44852a(10) =211570a(11) =1005427a(12) =4810460a(13) =23157904a(14) =112110906a(15) =545524287a(16) =2666864340a(17) =13092764136a(18) =64527778938a(19) =319157531592
External references
- oeis: A025264