a(n) = n*a(n-1) + (n-2)*a(n-2), with a(0) = 0, a(1) = 1.
A000153
a(n) = n*a(n-1) + (n-2)*a(n-2), with a(0) = 0, a(1) = 1.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =7a(4) =32a(5) =181a(6) =1214a(7) =9403a(8) =82508a(9) =808393a(10) =8743994a(11) =103459471a(12) =1328953592a(13) =18414450877a(14) =273749755382
External references
- oeis: A000153