a(n) = P(n+1, n+1) where P(n, m) = P(n, m-1) + P(n-1, m + f(m-n)) for n < m with P(n, m) = P(n-1, m) for 0 <= m <= n and P(0, m) = 1 for m >= 0 and where f(n) = [(n mod 6) > 0].
A376395
a(n) = P(n+1, n+1) where P(n, m) = P(n, m-1) + P(n-1, m + f(m-n)) for n < m with P(n, m) = P(n-1, m) for 0 <= m <= n and P(0, m) = 1 for m >= 0 and where f(n) = [(n mod 6) > 0].
Terms
- a(0) =1a(1) =2a(2) =6a(3) =23a(4) =102a(5) =492a(6) =2494a(7) =13049a(8) =69804a(9) =379739a(10) =2093908a(11) =11676674a(12) =65742586a(13) =373229312a(14) =2134271056a(15) =12282634251a(16) =71086381856a(17) =413492903669
External references
- oeis: A376395