Number of induced paths in the n-ladder graph P_2 X P_n.

Terms

a(0) =1a(1) =8a(2) =25a(3) =58a(4) =117a(5) =218a(6) =387a(7) =666a(8) =1123a(9) =1868a(10) =3079a(11) =5044a(12) =8229a(13) =13388a(14) =21741a(15) =35262a(16) =57145a(17) =92558a(18) =149863a(19) =242590a(20) =392631a(21) =635408a(22) =1028235a(23) =1663848a(24) =2692297a(25) =4356368a(26) =7048897a(27) =11405506a(28) =18454653a(29) =29860418