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, 0, 0), (0, 1, -1), (1, -1, -1), (1, 1, 0)}.
A148601
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, 0, 0), (0, 1, -1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =192a(7) =630a(8) =2222a(9) =7872a(10) =28842a(11) =107014a(12) =402690a(13) =1535567a(14) =5935554a(15) =23190450a(16) =91439933a(17) =363782442a(18) =1457249535a(19) =5875506769a(20) =23844339146a(21) =97353820899a(22) =399612884235
External references
- oeis: A148601