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), (-1, 0, 1), (1, 1, -1), (1, 1, 1)}.
A149575
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), (-1, 0, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =65a(5) =209a(6) =1045a(7) =3729a(8) =18645a(9) =70717a(10) =353585a(11) =1395805a(12) =6979025a(13) =28339645a(14) =141698225a(15) =587614085a(16) =2938070425a(17) =12383615985a(18) =61918079925a(19) =264376635889
External references
- oeis: A149575