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), (0, 0, 1), (0, 1, -1), (0, 1, 0), (1, 0, -1)}.
A150051
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), (0, 0, 1), (0, 1, -1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =61a(5) =220a(6) =831a(7) =3242a(8) =12963a(9) =53065a(10) =221135a(11) =935161a(12) =4004490a(13) =17340560a(14) =75815025a(15) =334224425a(16) =1484309666a(17) =6635773200a(18) =29842139692a(19) =134917595387a(20) =612911928917
External references
- oeis: A150051