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, 1, 1), (0, 1, -1), (1, 0, 1)}.
A148792
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, 1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =77a(6) =258a(7) =859a(8) =2951a(9) =10083a(10) =35463a(11) =124321a(12) =440777a(13) =1564412a(14) =5613436a(15) =20126465a(16) =72600868a(17) =262274477a(18) =952091511a(19) =3458207202a(20) =12605564464a(21) =46002034866a(22) =168328851812a(23) =616532841066
External references
- oeis: A148792