Binomial variation of the Catalan numbers: a(n) = sum( binomial(n-i, i)*a(i)*a(n-1-i), i=0..(n-1) ) with a(0)=1.
A188479
Binomial variation of the Catalan numbers: a(n) = sum( binomial(n-i, i)*a(i)*a(n-1-i), i=0..(n-1) ) with a(0)=1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =40a(6) =156a(7) =700a(8) =3520a(9) =19592a(10) =119992a(11) =801272a(12) =5792464a(13) =45071600a(14) =375615696a(15) =3338063600a(16) =31511918816a(17) =314913425280
External references
- oeis: A188479