Number of paths from (0,0) to (n,0), with vertices (i,k) satisfying 0 <= k <= 3, consisting of segments given by the vectors (1,1), (1,2), (1,-1).
A247323
Number of paths from (0,0) to (n,0), with vertices (i,k) satisfying 0 <= k <= 3, consisting of segments given by the vectors (1,1), (1,2), (1,-1).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =5a(6) =7a(7) =18a(8) =29a(9) =63a(10) =116a(11) =229a(12) =445a(13) =856a(14) =1677a(15) =3229a(16) =6298a(17) =12185a(18) =23675a(19) =45922a(20) =89097a(21) =172931a(22) =335460a(23) =651065a(24) =1263145a(25) =2451184a(26) =4756105a(27) =9228777a(28) =17907538a(29) =34747357
External references
- oeis: A247323