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, 0)}.
A149194
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, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =127a(6) =493a(7) =1849a(8) =7444a(9) =29523a(10) =122641a(11) =503166a(12) =2139489a(13) =8990962a(14) =38889133a(15) =166435151a(16) =729268850a(17) =3166004539a(18) =14014630572a(19) =61540779798a(20) =274683353115
External references
- oeis: A149194