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), (0, 0, -1), (1, -1, 1), (1, 1, 0)}.
A149290
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), (0, 0, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =45a(5) =166a(6) =690a(7) =2855a(8) =12285a(9) =53326a(10) =236418a(11) =1055922a(12) =4775694a(13) =21756372a(14) =99872916a(15) =461231199a(16) =2142096957a(17) =9994262278a(18) =46832422494a(19) =220275851510
External references
- oeis: A149290