Number of non-unimodal sequences of length n covering an initial interval of positive integers.
A328509
Number of non-unimodal sequences of length n covering an initial interval of positive integers.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =3a(4) =41a(5) =425a(6) =4287a(7) =45941a(8) =541219a(9) =7071501a(10) =102193755a(11) =1622448861a(12) =28090940363a(13) =526856206877
External references
- oeis: A328509