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, -1), (-1, -1, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149813
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, -1), (-1, -1, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =26a(5) =71a(6) =229a(7) =744a(8) =2409a(9) =8124a(10) =27190a(11) =93997a(12) =339021a(13) =1214115a(14) =4385648a(15) =15983458a(16) =58302056a(17) =217544034a(18) =820036649a(19) =3084534154a(20) =11674973196a(21) =44268101746a(22) =168984174425a(23) =652759187170
External references
- oeis: A149813