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, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148364
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, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =47a(6) =153a(7) =515a(8) =1781a(9) =6290a(10) =22593a(11) =82141a(12) =301643a(13) =1117894a(14) =4173685a(15) =15679942a(16) =59231389a(17) =224775911a(18) =856426691a(19) =3274980603a(20) =12562759119a(21) =48323739885a(22) =186348608027a(23) =720198605807
External references
- oeis: A148364