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), (-1, 0, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148785
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), (-1, 0, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =79a(6) =272a(7) =952a(8) =3489a(9) =13099a(10) =49492a(11) =191991a(12) =756217a(13) =2987651a(14) =12009132a(15) =48784729a(16) =198487593a(17) =817580395a(18) =3394076108a(19) =14101066526a(20) =59132483007a(21) =249475228049
External references
- oeis: A148785