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, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148648
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, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =23a(5) =62a(6) =269a(7) =850a(8) =3891a(9) =13419a(10) =62990a(11) =229483a(12) =1093201a(13) =4139300a(14) =19918865a(15) =77643783a(16) =376413282a(17) =1501052044a(18) =7317882715a(19) =29721764794a(20) =145523007631a(21) =600006212256
External references
- oeis: A148648