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, 0, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.
A149197
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, 0, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =127a(6) =498a(7) =1846a(8) =7458a(9) =29123a(10) =120377a(11) =486047a(12) =2044320a(13) =8456536a(14) =36043135a(15) =151821939a(16) =653902619a(17) =2792757249a(18) =12132725385a(19) =52385920494a(20) =229244652005a(21) =998645414067
External references
- oeis: A149197