Triangle read by rows: Number of walks from (0,0) to (3n,3k) on the square lattice with up and right steps where squares (x,y)=(1,1) mod 3 or (x,y)=(2,2) mod 3 are not entered.
A348595
Triangle read by rows: Number of walks from (0,0) to (3n,3k) on the square lattice with up and right steps where squares (x,y)=(1,1) mod 3 or (x,y)=(2,2) mod 3 are not entered.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =1a(4) =8a(5) =28a(6) =1a(7) =12a(8) =64a(9) =212a(10) =1a(11) =16a(12) =116a(13) =520a(14) =1676a(15) =1a(16) =20a(17) =184a(18) =1052a(19) =4288a(20) =13604a(21) =1a(22) =24a(23) =268a(24) =1872a(25) =9316a(26) =35784a(27) =112380a(28) =1a(29) =28
External references
- oeis: A348595