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, 0), (1, 0, 1)}.
A150306
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, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =83a(5) =287a(6) =1211a(7) =4518a(8) =19806a(9) =77422a(10) =347954a(11) =1403992a(12) =6420476a(13) =26507997a(14) =122781595a(15) =515819832a(16) =2412709928a(17) =10275378478a(18) =48434841254a(19) =208558848383a(20) =989231211470
External references
- oeis: A150306