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, 1, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148430
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, 1, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =19a(5) =59a(6) =219a(7) =774a(8) =3145a(9) =11859a(10) =49307a(11) =195291a(12) =833909a(13) =3407800a(14) =14788168a(15) =61947528a(16) =272400290a(17) =1162004530a(18) =5161800599a(19) =22345394684a(20) =100082432241a(21) =438344267322
External references
- oeis: A148430