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, -1, 1), (-1, 0, 0), (1, 1, -1), (1, 1, 1)}.
A149641
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, -1, 1), (-1, 0, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =235a(6) =1147a(7) =4261a(8) =20885a(9) =81049a(10) =399677a(11) =1609593a(12) =7961105a(13) =32824569a(14) =162734865a(15) =683496555a(16) =3394132835a(17) =14457881135a(18) =71884823559a(19) =309701765151
External references
- oeis: A149641