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, 1, 0), (1, 0, -1), (1, 0, 1)}.
A149152
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, 1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =118a(6) =498a(7) =1693a(8) =7476a(9) =27274a(10) =121508a(11) =459786a(12) =2088146a(13) =8159974a(14) =37273054a(15) =148506527a(16) =685469238a(17) =2782946570a(18) =12891587770a(19) =52985836682a(20) =247036106682
External references
- oeis: A149152