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, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148575
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, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =50a(6) =181a(7) =513a(8) =1981a(9) =6087a(10) =24450a(11) =79265a(12) =326192a(13) =1098561a(14) =4604660a(15) =15968636a(16) =67934917a(17) =241144724a(18) =1037831560a(19) =3753744245a(20) =16303956286a(21) =59889623003a(22) =262114436704a(23) =975484574708
External references
- oeis: A148575