T(n,k) is the number of (n+1) X (k+1) 0..2 matrices with each 2 X 2 permanent equal.

Terms

a(0) =81a(1) =253a(2) =253a(3) =759a(4) =1935a(5) =759a(6) =2653a(7) =12641a(8) =12641a(9) =2653a(10) =9273a(11) =113261a(12) =117959a(13) =113261a(14) =9273a(15) =34545a(16) =979821a(17) =1930229a(18) =1930229a(19) =979821a(20) =34545a(21) =130067a(22) =9045373a(23) =23865033a(24) =68599847a(25) =23865033a(26) =9045373a(27) =130067a(28) =502563a(29) =82894903