406575
domain: N
Appears in sequences
- Number of -7..7 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.at n=6A199897
- Number of -n..n arrays x(0..6) of 7 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.at n=6A199902
- a(n) = (n^2 - 3*n + 6)*binomial(n+2,3)/4.at n=25A301973