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, 0), (1, 0, -1), (1, 0, 1)}.
A148689
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, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =64a(6) =223a(7) =687a(8) =2459a(9) =7976a(10) =29161a(11) =98220a(12) =363684a(13) =1255136a(14) =4697743a(15) =16532383a(16) =62333291a(17) =222486904a(18) =844306885a(19) =3049733340a(20) =11628659492a(21) =42393330464a(22) =162344706129a(23) =596613541348
External references
- oeis: A148689