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, 0), (0, 0, -1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
A150218
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, 0), (0, 0, -1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =82a(5) =321a(6) =1299a(7) =5392a(8) =22871a(9) =98108a(10) =424699a(11) =1856216a(12) =8183556a(13) =36317895a(14) =161980553a(15) =725942682a(16) =3268471012a(17) =14774712211a(18) =67005494929a(19) =304779943331
External references
- oeis: A150218