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, -1), (1, 0, -1), (1, 1, 0)}.
A148582
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, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =52a(6) =180a(7) =531a(8) =1935a(9) =6087a(10) =23263a(11) =76284a(12) =302460a(13) =1024293a(14) =4164341a(15) =14491325a(16) =59869889a(17) =213175734a(18) =890626586a(19) =3231206448a(20) =13626322744a(21) =50188107221a(22) =213489198731a(23) =796147909708
External references
- oeis: A148582