Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, -1), (1, 1)}.
A151275
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =61a(5) =199a(6) =939a(7) =3389a(8) =16129a(9) =61601a(10) =295373a(11) =1169939a(12) =5643023a(13) =22931063a(14) =111114587a(15) =460242509a(16) =2238229577a(17) =9409963861a(18) =45894616065a(19) =195273012089a(20) =954636984885
External references
- oeis: A151275