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, 0), (1, 0, 1), (1, 1, -1)}.
A148971
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, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =102a(6) =396a(7) =1454a(8) =5877a(9) =22415a(10) =93613a(11) =373105a(12) =1590574a(13) =6494352a(14) =28142556a(15) =117343359a(16) =514812790a(17) =2179682962a(18) =9658749443a(19) =41415470371a(20) =185020861727a(21) =801523426999
External references
- oeis: A148971