First differences of A161340.

Terms

a(0) =1a(1) =26a(2) =56a(3) =260a(4) =56a(5) =392a(6) =392a(7) =2192a(8) =56a(9) =392a(10) =392a(11) =2744a(12) =392a(13) =2744a(14) =2744a(15) =16952a(16) =56a(17) =392a(18) =392a(19) =2744a(20) =392a(21) =2744a(22) =2744a(23) =19208a(24) =392a(25) =2744a(26) =2744a(27) =19208a(28) =2744a(29) =19208