Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149690
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =271a(6) =1163a(7) =4943a(8) =21957a(9) =97293a(10) =437619a(11) =1990411a(12) =9106641a(13) =41875849a(14) =194172363a(15) =903120009a(16) =4218128269a(17) =19796225031a(18) =93155136939a(19) =439615252675
External references
- oeis: A149690