The trinomial transform (A027907) gives powers of 3, while the trinomial transform of this sequence shift one place left gives powers of 5.

A101617

The trinomial transform (A027907) gives powers of 3, while the trinomial transform of this sequence shift one place left gives powers of 5.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =-3a(5) =19a(6) =-43a(7) =139a(8) =-355a(9) =995a(10) =-2587a(11) =6907a(12) =-17939a(13) =46931a(14) =-121419a(15) =314603a(16) =-811203a(17) =2091459a(18) =-5379963a(19) =13833179a(20) =-35527795a(21) =91210035a(22) =-234020267a(23) =600258507a(24) =-1539135779a(25) =3945762211a(26) =-10113490139a(27) =25918908603a(28) =-66417608403a(29) =170182721299

External references