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), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
A148990
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), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =115a(6) =441a(7) =1643a(8) =6407a(9) =24603a(10) =96779a(11) =377445a(12) =1492297a(13) =5871099a(14) =23287029a(15) =92099083a(16) =366082077a(17) =1452638305a(18) =5782634569a(19) =22995888507a(20) =91639232473a(21) =364963107847
External references
- oeis: A148990