a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.
A025228
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.
Terms
- a(0) =2a(1) =1a(2) =4a(3) =17a(4) =76a(5) =354a(6) =1704a(7) =8421a(8) =42508a(9) =218318a(10) =1137400a(11) =5996938a(12) =31940792a(13) =171605956a(14) =928931280a(15) =5061593709a(16) =27739833228a(17) =152809506582a(18) =845646470616
External references
- oeis: A025228