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, 1, -1)}.
A149020
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, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =36a(5) =116a(6) =512a(7) =1904a(8) =8553a(9) =33148a(10) =153051a(11) =618001a(12) =2903351a(13) =12003571a(14) =57034787a(15) =240562562a(16) =1152190595a(17) =4930768743a(18) =23767357634a(19) =102908808435a(20) =498548562369
External references
- oeis: A149020