One-half the number of permutations of length n with exactly 3 rising or falling successions.
A001267
One-half the number of permutations of length n with exactly 3 rising or falling successions.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =8a(6) =60a(7) =444a(8) =3599a(9) =32484a(10) =325322a(11) =3582600a(12) =43029621a(13) =559774736a(14) =7841128936a(15) =117668021988
External references
- oeis: A001267