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, 0, 1), (-1, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149572
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, 0, 1), (-1, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =203a(6) =999a(7) =3587a(8) =17759a(9) =67651a(10) =336021a(11) =1331219a(12) =6625527a(13) =26986373a(14) =134486323a(15) =559145055a(16) =2788924975a(17) =11780888151a(18) =58797042195a(19) =251528398701
External references
- oeis: A149572