a(n) = [x^n] f(x)^n, where f(x) = (1 - x^7)^7/((1 - x^2)^2 * (1 - x^5)^5).

Terms

a(0) =1a(1) =0a(2) =4a(3) =0a(4) =36a(5) =25a(6) =364a(7) =441a(8) =3876a(9) =6561a(10) =43779a(11) =91839a(12) =513900a(13) =1245699a(14) =6201199a(15) =16645750a(16) =76379940a(17) =220760742a(18) =955328863a(19) =2916666288a(20) =12090544611a(21) =38466060066a(22) =154437142545a(23) =506976137710