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, 1), (0, 0, -1), (0, 1, 1), (1, 0, -1)}.
A148725
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, 1), (0, 0, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =72a(6) =278a(7) =916a(8) =3672a(9) =12993a(10) =53655a(11) =199801a(12) =841352a(13) =3247398a(14) =13885219a(15) =55084307a(16) =238324288a(17) =965836929a(18) =4218990574a(19) =17394476665a(20) =76585028175a(21) =320237085936
External references
- oeis: A148725