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, 0, 0), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
A148923
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, 0, 0), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =26a(5) =93a(6) =324a(7) =1166a(8) =4460a(9) =16830a(10) =65812a(11) =262065a(12) =1040722a(13) =4238726a(14) =17350012a(15) =71315206a(16) =297591380a(17) =1243539526a(18) =5233329983a(19) =22203852930a(20) =94322737558a(21) =403548101523
External references
- oeis: A148923