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), (-1, 1, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A149456
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), (-1, 1, 1), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =50a(5) =190a(6) =782a(7) =3215a(8) =13641a(9) =58212a(10) =252802a(11) =1103636a(12) =4869562a(13) =21584696a(14) =96367184a(15) =431885369a(16) =1945585545a(17) =8792673332a(18) =39891459357a(19) =181472254821a(20) =828054203296
External references
- oeis: A149456