Triangle T(n,p) read by rows: the number of n-celled polyominoes with perimeter 2p, 2 <= p <= 1+n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =2a(6) =0a(7) =0a(8) =1a(9) =4a(10) =0a(11) =0a(12) =0a(13) =1a(14) =11a(15) =0a(16) =0a(17) =0a(18) =1a(19) =7a(20) =27a(21) =0a(22) =0a(23) =0a(24) =0a(25) =4a(26) =21a(27) =83a(28) =0a(29) =0