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), (-1, 0, 0), (0, 1, 1), (1, 0, -1)}.
A148342
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), (-1, 0, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =39a(6) =127a(7) =405a(8) =1318a(9) =4466a(10) =15550a(11) =53884a(12) =193390a(13) =695626a(14) =2533119a(15) =9358466a(16) =34732921a(17) =129973012a(18) =491079718a(19) =1861380970a(20) =7112950619a(21) =27328619931a(22) =105348098378a(23) =408522462226
External references
- oeis: A148342