a(n) = 3^n*hypergeom([-n/3, (1-n)/3, (2-n)/3], [1, 1], -1).
A294035
a(n) = 3^n*hypergeom([-n/3, (1-n)/3, (2-n)/3], [1, 1], -1).
Terms
- a(0) =1a(1) =3a(2) =9a(3) =33a(4) =153a(5) =783a(6) =4059a(7) =21087a(8) =110889a(9) =592899a(10) =3214989a(11) =17608077a(12) =97150491a(13) =539331237a(14) =3010588317a(15) =16887545793a(16) =95134584969a(17) =537942476907
External references
- oeis: A294035