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, 0, 0), (0, -1, 1), (0, 1, 0), (1, -1, 1), (1, 1, -1)}.
A148901
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, 0, 0), (0, -1, 1), (0, 1, 0), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =111a(6) =449a(7) =1819a(8) =7720a(9) =33168a(10) =145938a(11) =649121a(12) =2928423a(13) =13329644a(14) =61233113a(15) =283276432a(16) =1319087860a(17) =6175891798a(18) =29058459670a(19) =137308405543a(20) =651318916557
External references
- oeis: A148901