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, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149741
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, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =77a(5) =313a(6) =1461a(7) =6377a(8) =30137a(9) =136451a(10) =651723a(11) =3016195a(12) =14502915a(13) =68098479a(14) =329177579a(15) =1561522961a(16) =7577800745a(17) =36219905503a(18) =176326651911a(19) =847707006233
External references
- oeis: A149741