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, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148597
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, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =181a(7) =614a(8) =2065a(9) =7187a(10) =25715a(11) =91882a(12) =339952a(13) =1255952a(14) =4688152a(15) =17845805a(16) =67869690a(17) =260527011a(18) =1011149605a(19) =3928242907a(20) =15392168191a(21) =60611371163a(22) =239354202792a(23) =951872802880
External references
- oeis: A148597