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, -1, 1), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
A148371
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, -1, 1), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =42a(6) =147a(7) =456a(8) =1620a(9) =5424a(10) =20268a(11) =70035a(12) =268274a(13) =965881a(14) =3747327a(15) =13832768a(16) =54637692a(17) =205345376a(18) =819088438a(19) =3135288734a(20) =12618024850a(21) =48888113766a(22) =198474213011a(23) =777692685231
External references
- oeis: A148371