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, 0, 1), (-1, 1, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148492
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, 0, 1), (-1, 1, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =81a(6) =325a(7) =1348a(8) =5757a(9) =25140a(10) =111909a(11) =505288a(12) =2308464a(13) =10647067a(14) =49502830a(15) =231719158a(16) =1090976509a(17) =5162200449a(18) =24532023007a(19) =117023282850a(20) =560084216123
External references
- oeis: A148492