Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.

A199842

Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.

Terms

    a(0) =1a(1) =4a(2) =13a(3) =42a(4) =132a(5) =428a(6) =1393a(7) =4561a(8) =15032a(9) =49889a(10) =166542a(11) =558744a(12) =1883028a(13) =6370957a(14) =21628455a(15) =73641852a(16) =251385571a(17) =860067894a(18) =2948380732a(19) =10124956970a(20) =34823894885a(21) =119940097035a(22) =413612099138

External references