Number of arrays of -3..3 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.
A193705
Number of arrays of -3..3 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) =7a(2) =43a(3) =309a(4) =1565a(5) =8281a(6) =43977a(7) =233983a(8) =1246261a(9) =6642635a(10) =35404681a(11) =188678871a(12) =1005542727a(13) =5358879227a(14) =28558908161a(15) =152197318255a(16) =811095694201
External references
- oeis: A193705