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), (0, 0, -1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149577
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), (0, 0, -1), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =51a(5) =199a(6) =755a(7) =2821a(8) =11457a(9) =45421a(10) =180609a(11) =740097a(12) =3026837a(13) =12362553a(14) =51258493a(15) =213094839a(16) =885144315a(17) =3704575695a(18) =15563367115a(19) =65372995019a(20) =275716820519
External references
- oeis: A149577