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, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148807
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, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =84a(6) =310a(7) =1124a(8) =4308a(9) =16899a(10) =67411a(11) =274117a(12) =1133883a(13) =4734386a(14) =20046775a(15) =85635245a(16) =368968792a(17) =1603346851a(18) =7012855376a(19) =30873802596a(20) =136729416911a(21) =608572823741
External references
- oeis: A148807