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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148503
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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =15a(5) =37a(6) =123a(7) =369a(8) =1215a(9) =3873a(10) =13439a(11) =46389a(12) =166211a(13) =587241a(14) =2139343a(15) =7853281a(16) =29436835a(17) =110256257a(18) =417088191a(19) =1589755941a(20) =6134996203a(21) =23788716713a(22) =92647968427a(23) =362538770889
External references
- oeis: A148503