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, 1), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
A148872
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, 1), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =29a(5) =95a(6) =371a(7) =1391a(8) =5579a(9) =22515a(10) =93172a(11) =389984a(12) =1660907a(13) =7129259a(14) =30986277a(15) =135626950a(16) =598601472a(17) =2659537838a(18) =11888774528a(19) =53438424419a(20) =241407630975
External references
- oeis: A148872