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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148499
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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =15a(5) =33a(6) =101a(7) =271a(8) =809a(9) =2383a(10) =7153a(11) =22267a(12) =69181a(13) =219153a(14) =699165a(15) =2238795a(16) =7310623a(17) =23850477a(18) =78679013a(19) =260481641a(20) =865028627a(21) =2903853937a(22) =9751449631a(23) =32965825969a(24) =111723673671a(25) =379469858211
External references
- oeis: A148499