a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,1,2.
A025272
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,1,2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =17a(6) =50a(7) =150a(8) =458a(9) =1420a(10) =4460a(11) =14165a(12) =45422a(13) =146870a(14) =478366a(15) =1568076a(16) =5169332a(17) =17127466a(18) =57005220a(19) =190503772a(20) =638986740a(21) =2150472248a(22) =7259433880a(23) =24574658829a(24) =83404648534a(25) =283742556262a(26) =967415888822
External references
- oeis: A025272