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, 0), (0, 1, -1), (1, 0, 1)}.
A148921
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, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =26a(5) =90a(6) =321a(7) =1137a(8) =4214a(9) =16216a(10) =62231a(11) =242631a(12) =968206a(13) =3885959a(14) =15683551a(15) =64124180a(16) =264329268a(17) =1093562973a(18) =4555281146a(19) =19109956151a(20) =80485553261a(21) =340317180230
External references
- oeis: A148921