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, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
A148707
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, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =75a(6) =263a(7) =859a(8) =3027a(9) =10847a(10) =40277a(11) =148941a(12) =558955a(13) =2091905a(14) =7964021a(15) =30592053a(16) =118488259a(17) =459892963a(18) =1797038297a(19) =7045304575a(20) =27753725487a(21) =109797374923a(22) =436241707057
External references
- oeis: A148707