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, 0, 1), (1, 0, 1), (1, 1, -1)}.
A148824
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, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =83a(6) =294a(7) =977a(8) =3580a(9) =12456a(10) =46593a(11) =166515a(12) =630911a(13) =2297213a(14) =8787547a(15) =32445419a(16) =124982926a(17) =466281903a(18) =1805459403a(19) =6790584441a(20) =26402173582a(21) =99954779840a(22) =389910514022
External references
- oeis: A148824