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, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148380
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, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =48a(6) =160a(7) =531a(8) =1870a(9) =6524a(10) =23574a(11) =84928a(12) =312864a(13) =1150386a(14) =4293426a(15) =16017483a(16) =60369252a(17) =227575756a(18) =864161558a(19) =3283431528a(20) =12541744032a(21) =47943856414a(22) =184003950632a(23) =706809708056
External references
- oeis: A148380