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), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149821
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), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =80a(6) =256a(7) =858a(8) =2846a(9) =9720a(10) =34636a(11) =124014a(12) =450954a(13) =1671044a(14) =6239162a(15) =23442604a(16) =89532806a(17) =344179622a(18) =1329638464a(19) =5174472574a(20) =20306201692a(21) =79953489688a(22) =316793120608
External references
- oeis: A149821