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, 1), (1, -1, -1)}.
A148049
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, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =10a(5) =20a(6) =58a(7) =139a(8) =438a(9) =1140a(10) =3418a(11) =9932a(12) =30628a(13) =88108a(14) =280662a(15) =840825a(16) =2681258a(17) =8069994a(18) =26491824a(19) =81571012a(20) =264345958a(21) =834289608a(22) =2744822564a(23) =8655497466a(24) =28654030002a(25) =91833730268a(26) =305378072266a(27) =978386996766
External references
- oeis: A148049