Number of arrays of -4..4 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.
A193706
Number of arrays of -4..4 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.
Terms
- a(0) =1a(1) =9a(2) =69a(3) =629a(4) =3617a(5) =23293a(6) =150639a(7) =974609a(8) =6275983a(9) =40514073a(10) =261520865a(11) =1687765963a(12) =10892349861a(13) =70298890683a(14) =453700338187
External references
- oeis: A193706