Number of unimodal functions f:[n]->[2n] with f(1)<>1 and f(i)<>f(i+1).
A226013
Number of unimodal functions f:[n]->[2n] with f(1)<>1 and f(i)<>f(i+1).
Terms
- a(0) =1a(1) =1a(2) =9a(3) =70a(4) =581a(5) =4956a(6) =43065a(7) =379093a(8) =3369301a(9) =30168268a(10) =271716644a(11) =2459014504a(12) =22342432139a(13) =203682343840
External references
- oeis: A226013