Triangle I(m,n) read by rows: number of perfect lattice paths on the m*n board.

Terms

a(0) =1a(1) =2a(2) =4a(3) =3a(4) =7a(5) =17a(6) =4a(7) =10a(8) =26a(9) =68a(10) =5a(11) =13a(12) =35a(13) =95a(14) =259a(15) =6a(16) =16a(17) =44a(18) =122a(19) =340a(20) =950a(21) =7a(22) =19a(23) =53a(24) =149a(25) =421a(26) =1193a(27) =3387a(28) =8a(29) =22