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, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149541
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, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =53a(5) =181a(6) =797a(7) =2903a(8) =12859a(9) =50331a(10) =225839a(11) =906225a(12) =4129853a(13) =17040887a(14) =77913159a(15) =326996909a(16) =1510147553a(17) =6422569359a(18) =29747117651a(19) =128073608665a(20) =596327616089
External references
- oeis: A149541