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, 1), (-1, 0, 1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
A149972
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, 1), (-1, 0, 1), (0, 1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =55a(5) =206a(6) =805a(7) =3242a(8) =13477a(9) =57053a(10) =246156a(11) =1077655a(12) =4773424a(13) =21378709a(14) =96572231a(15) =439708996a(16) =2015776682a(17) =9295605228a(18) =43098363308a(19) =200758507109a(20) =939156465191
External references
- oeis: A149972