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, 1, -1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
A148356
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, 1, -1), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =45a(6) =145a(7) =495a(8) =1724a(9) =6232a(10) =22887a(11) =86143a(12) =327785a(13) =1268920a(14) =4962428a(15) =19616234a(16) =78333373a(17) =315060648a(18) =1278492049a(19) =5217230819a(20) =21446008407a(21) =88584981957a(22) =368030415106
External references
- oeis: A148356