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, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148940
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, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =29a(5) =99a(6) =360a(7) =1357a(8) =5203a(9) =20370a(10) =81126a(11) =327936a(12) =1341708a(13) =5538553a(14) =23057491a(15) =96745210a(16) =408716932a(17) =1736757396a(18) =7418365253a(19) =31835377665a(20) =137216306947a(21) =593770969859
External references
- oeis: A148940