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, 0), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
A149157
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, 0), (-1, 1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =39a(5) =112a(6) =514a(7) =1664a(8) =7833a(9) =27346a(10) =130723a(11) =479977a(12) =2317526a(13) =8827710a(14) =42919942a(15) =168085941a(16) =821366455a(17) =3287613734a(18) =16126250115a(19) =65690433233a(20) =323170950475
External references
- oeis: A149157