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, 1), (0, 1, -1), (1, 0, 0)}.
A148077
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, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =24a(6) =60a(7) =171a(8) =482a(9) =1397a(10) =4253a(11) =12734a(12) =39807a(13) =124496a(14) =393876a(15) =1271415a(16) =4091866a(17) =13406172a(18) =44050521a(19) =145678352a(20) =486558215a(21) =1626299970a(22) =5484672863a(23) =18549475207a(24) =63002376085a(25) =215196629904a(26) =736195482482
External references
- oeis: A148077