a(n) = T(2n, n), where T is the Delannoy triangle (A008288).
A026000
a(n) = T(2n, n), where T is the Delannoy triangle (A008288).
Terms
- a(0) =1a(1) =5a(2) =41a(3) =377a(4) =3649a(5) =36365a(6) =369305a(7) =3800305a(8) =39490049a(9) =413442773a(10) =4354393801a(11) =46082942185a(12) =489658242241
External references
- oeis: A026000