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, 1), (0, 0, 1), (1, 1, -1)}.
A148452
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, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =51a(6) =173a(7) =575a(8) =2019a(9) =7243a(10) =26322a(11) =97884a(12) =367911a(13) =1400005a(14) =5389926a(15) =20912874a(16) =81885031a(17) =322824487a(18) =1281038396a(19) =5114281062a(20) =20522900399a(21) =82766997179a(22) =335260408347
External references
- oeis: A148452