Constant term in the expansion of (1 + x + y + z + 1/x + 1/y + 1/z)^n.
A328713
Constant term in the expansion of (1 + x + y + z + 1/x + 1/y + 1/z)^n.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =19a(4) =127a(5) =511a(6) =3301a(7) =16297a(8) =103279a(9) =570367a(10) =3595177a(11) =21167917a(12) =133789789a(13) =818625133a(14) =5207248879a(15) =32649752779a(16) =209258291599
External references
- oeis: A328713