One-half the number of permutations of length n with exactly 4 rising or falling successions.
A001268
One-half the number of permutations of length n with exactly 4 rising or falling successions.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =11a(7) =113a(8) =1099a(9) =11060a(10) =118484a(11) =1366134a(12) =16970322a(13) =226574211a(14) =3240161105a(15) =49453685911a(16) =802790789101
External references
- oeis: A001268