If n = 0 or 1 then a(n) = 1; if n = 2, 3 or 4 then a(n) = 0; otherwise a(n) = (n+1)*a(n-1)-(n-2)*a(n-2)-(n-5)*a(n-3)+(n-3)*a(n-4).
A085372
If n = 0 or 1 then a(n) = 1; if n = 2, 3 or 4 then a(n) = 0; otherwise a(n) = (n+1)*a(n-1)-(n-2)*a(n-2)-(n-5)*a(n-3)+(n-3)*a(n-4).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =2a(6) =14a(7) =102a(8) =828a(9) =7522a(10) =75706a(11) =836622a(12) =10073824a(13) =131300266a(14) =1841921270a(15) =27673138086a(16) =443343106468
External references
- oeis: A085372