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), (-1, 1, -1), (1, 0, -1), (1, 1, 0)}.
A148754
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), (-1, 1, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =28a(5) =77a(6) =326a(7) =1028a(8) =4508a(9) =15255a(10) =68726a(11) =244025a(12) =1118063a(13) =4116292a(14) =19085963a(15) =72237186a(16) =337973128a(17) =1307388767a(18) =6159989671a(19) =24254325742a(20) =114924609231a(21) =459192728592
External references
- oeis: A148754