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, 1), (1, 1, -1)}.
A148385
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, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =50a(6) =172a(7) =584a(8) =2099a(9) =7511a(10) =27744a(11) =102149a(12) =383428a(13) =1437628a(14) =5459131a(15) =20725518a(16) =79351092a(17) =303885651a(18) =1170633340a(19) =4512011156a(20) =17464075298a(21) =67640759405a(22) =262790111030
External references
- oeis: A148385