a(0)=1; for n>0, a(n) = 2*5^(n-1) - (1/2)*Sum_{i=1..n-1} a(i)*a(n-i).
A085362
a(0)=1; for n>0, a(n) = 2*5^(n-1) - (1/2)*Sum_{i=1..n-1} a(i)*a(n-i).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =34a(4) =150a(5) =678a(6) =3116a(7) =14494a(8) =68032a(9) =321590a(10) =1528776a(11) =7301142a(12) =35003238a(13) =168359754a(14) =812041860a(15) =3926147730a(16) =19022666310a(17) =92338836390a(18) =448968093320
External references
- oeis: A085362