Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=4*i and -4<p(i)-p(i-1)<=4.
A180909
Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=4*i and -4<p(i)-p(i-1)<=4.
Terms
- a(0) =1a(1) =5a(2) =34a(3) =245a(4) =1827a(5) =13875a(6) =106612a(7) =825764a(8) =6432933a(9) =50331286a(10) =395107108a(11) =3109826951a(12) =24529022238a(13) =193811775229
External references
- oeis: A180909