Number of sequences of n integers p(i) i=0..n-1 with 0 <= p(i) <= 3*i and |p(i) - p(i-1)| <= 3.
A180899
Number of sequences of n integers p(i) i=0..n-1 with 0 <= p(i) <= 3*i and |p(i) - p(i-1)| <= 3.
Terms
- a(0) =1a(1) =4a(2) =22a(3) =130a(4) =803a(5) =5085a(6) =32747a(7) =213419a(8) =1403399a(9) =9292850a(10) =61877337a(11) =413894378a(12) =2779029389a(13) =18719276722a(14) =126438191373a(15) =856054836170
External references
- oeis: A180899