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, 0, 1), (0, 0, -1), (1, 1, 1)}.
A149585
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, 0, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =55a(5) =203a(6) =791a(7) =3041a(8) =12057a(9) =48249a(10) =194705a(11) =790373a(12) =3237213a(13) =13323957a(14) =55078721a(15) =228709819a(16) =953594747a(17) =3988265595a(18) =16730145283a(19) =70382381531a(20) =296830291631
External references
- oeis: A149585