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), (1, -1, 0), (1, 0, 1)}.
A148122
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), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =26a(6) =75a(7) =200a(8) =615a(9) =1734a(10) =5496a(11) =16190a(12) =52558a(13) =159708a(14) =527525a(15) =1643716a(16) =5498819a(17) =17440416a(18) =59076866a(19) =190207136a(20) =649511160a(21) =2120878068a(22) =7293205666a(23) =24044898984a(24) =83333951054a(25) =277186873640a(26) =965123750468
External references
- oeis: A148122