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), (0, 1, 1), (1, -1, 0)}.
A148347
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), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =39a(6) =127a(7) =405a(8) =1330a(9) =4478a(10) =15616a(11) =54421a(12) =194793a(13) =702460a(14) =2566274a(15) =9451947a(16) =35193820a(17) =131845947a(18) =497775471a(19) =1891195411a(20) =7227861089a(21) =27762928862a(22) =107200840091a(23) =415720406354
External references
- oeis: A148347