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, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.
A148560
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, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =50a(6) =150a(7) =492a(8) =1539a(9) =5371a(10) =17944a(11) =63704a(12) =225744a(13) =810809a(14) =2983535a(15) =10917690a(16) =40972337a(17) =153287379a(18) =581820688a(19) =2219375147a(20) =8508412508a(21) =32915586038a(22) =127540927543a(23) =498239905499
External references
- oeis: A148560