a(n) = sum_{i+j+k=n} (-1)^k*binomial(3*i+2*j+k,k) * (i/(2*j+i)) * binomial(2*j+i,j) *2^(i+j) * Catalan(i).
A153233
a(n) = sum_{i+j+k=n} (-1)^k*binomial(3*i+2*j+k,k) * (i/(2*j+i)) * binomial(2*j+i,j) *2^(i+j) * Catalan(i).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =27a(4) =157a(5) =957a(6) =6025a(7) =38847a(8) =255161a(9) =1701297a(10) =11485549a(11) =78362091a(12) =539518389a(13) =3744085725a(14) =26164480017a(15) =183976884639
External references
- oeis: A153233