a(0) = a(1) = 1; a(n) = a(n-1) + a(n-2) + Sum_{k=0..n-1} a(k) * a(n-k-1).
A307733
a(0) = a(1) = 1; a(n) = a(n-1) + a(n-2) + Sum_{k=0..n-1} a(k) * a(n-k-1).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =14a(4) =54a(5) =220a(6) =934a(7) =4090a(8) =18344a(9) =83850a(10) =389214a(11) =1829736a(12) =8693962a(13) =41685714a(14) =201442188a(15) =980091814a(16) =4797070022a(17) =23603701828a(18) =116688837886a(19) =579312087802
External references
- oeis: A307733