a(n) = (2*n-1) * a(n-1) - a(n-2), a(0) = 1, a(1) = 2.
A242227
a(n) = (2*n-1) * a(n-1) - a(n-2), a(0) = 1, a(1) = 2.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =23a(4) =156a(5) =1381a(6) =15035a(7) =194074a(8) =2896075a(9) =49039201a(10) =928848744a(11) =19456784423a(12) =446577192985
External references
- oeis: A242227