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, 1, -1), (1, -1, -1), (1, 1, 1)}.
A149080
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, 1, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =28a(5) =70a(6) =280a(7) =787a(8) =3148a(9) =9526a(10) =38104a(11) =120922a(12) =483688a(13) =1586248a(14) =6344992a(15) =21342211a(16) =85368844a(17) =292614958a(18) =1170459832a(19) =4075263994a(20) =16301055976a(21) =57458624464a(22) =229834497856a(23) =818786992666
External references
- oeis: A149080