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, 0), (0, -1, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
A148720
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, 0), (0, -1, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =24a(5) =76a(6) =277a(7) =1012a(8) =3900a(9) =15298a(10) =61744a(11) =252844a(12) =1055394a(13) =4456946a(14) =19066780a(15) =82383168a(16) =359267491a(17) =1579448039a(18) =6994656090a(19) =31175776248a(20) =139782570970a(21) =630064954347
External references
- oeis: A148720