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, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 1, -1)}.
A148213
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, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =89a(7) =263a(8) =849a(9) =2489a(10) =7948a(11) =26132a(12) =85913a(13) =276811a(14) =935850a(15) =3195236a(16) =10784937a(17) =36653147a(18) =127830808a(19) =444962432a(20) =1541290899a(21) =5409570385a(22) =19197622065a(23) =67828393121a(24) =240141102163a(25) =859491924151
External references
- oeis: A148213