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, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148431
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, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =19a(5) =60a(6) =227a(7) =809a(8) =3310a(9) =12663a(10) =53248a(11) =213217a(12) =918373a(13) =3796553a(14) =16616890a(15) =70310328a(16) =311537659a(17) =1341681580a(18) =6001753284a(19) =26205738839a(20) =118120354572a(21) =521464321540
External references
- oeis: A148431