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, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148904
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, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =102a(6) =442a(7) =1608a(8) =7186a(9) =28334a(10) =129212a(11) =535710a(12) =2480758a(13) =10642688a(14) =49853972a(15) =219281189a(16) =1036152285a(17) =4644935059a(18) =22096999787a(19) =100542924803a(20) =480894907633
External references
- oeis: A148904