Number of ordered subsequences of {1,...,n} containing at least three elements and such that the first differences contain only odd numbers.
A344004
Number of ordered subsequences of {1,...,n} containing at least three elements and such that the first differences contain only odd numbers.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =8a(5) =17a(6) =34a(7) =63a(8) =113a(9) =196a(10) =334a(11) =560a(12) =930a(13) =1532a(14) =2511a(15) =4099a(16) =6674a(17) =10845a(18) =17600a(19) =28535a(20) =46235a(21) =74880a(22) =121236a(23) =196248a(24) =317628a(25) =514032a(26) =831829a(27) =1346043a(28) =2178068a(29) =3524321
External references
- oeis: A344004