Number of up/down (or down/up) patterns of length n.
A350354
Number of up/down (or down/up) patterns of length n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =11a(5) =51a(6) =281a(7) =1809a(8) =13293a(9) =109899a(10) =1009343a(11) =10196895a(12) =112375149a(13) =1341625041a(14) =17249416717a(15) =237618939975
External references
- oeis: A350354