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, 0, 1), (0, 1, 0), (1, -1, -1)}.
A149815
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, 0, 1), (0, 1, 0), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =26a(5) =76a(6) =248a(7) =796a(8) =2654a(9) =8942a(10) =30952a(11) =112110a(12) =403446a(13) =1474050a(14) =5415092a(15) =20126040a(16) =76723180a(17) =291325720a(18) =1115293334a(19) =4283685580a(20) =16561655330a(21) =65111198066a(22) =255211841296
External references
- oeis: A149815