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), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148137
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), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =28a(6) =89a(7) =266a(8) =894a(9) =2887a(10) =10129a(11) =34934a(12) =126616a(13) =454347a(14) =1684358a(15) =6242626a(16) =23641108a(17) =89693829a(18) =345105492a(19) =1333739582a(20) =5208633463a(21) =20435993351a(22) =80769046108a(23) =320745663196
External references
- oeis: A148137