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, 0, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
A148942
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, 0, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =29a(5) =102a(6) =377a(7) =1427a(8) =5607a(9) =22385a(10) =91052a(11) =376310a(12) =1571765a(13) =6639385a(14) =28308973a(15) =121592782a(16) =526113092a(17) =2290577464a(18) =10026061720a(19) =44109530360a(20) =194927319780a(21) =864880150477
External references
- oeis: A148942