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, 0), (1, 0, 1)}.
A149906
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, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =48a(5) =166a(6) =622a(7) =2326a(8) =9309a(9) =36739a(10) =151832a(11) =620493a(12) =2633507a(13) =11037726a(14) =47677709a(15) =203638448a(16) =892014016a(17) =3865883495a(18) =17116446248a(19) =75049236217a(20) =335181357964
External references
- oeis: A149906