Number of n-element subsets of [n+7] having an even sum.

Terms

a(0) =1a(1) =4a(2) =16a(3) =60a(4) =170a(5) =396a(6) =848a(7) =1716a(8) =3235a(9) =5720a(10) =9696a(11) =15912a(12) =25236a(13) =38760a(14) =58080a(15) =85272a(16) =122661a(17) =173052a(18) =240240a(19) =328900a(20) =444158a(21) =592020a(22) =780208a(23) =1017900a(24) =1315015a(25) =1682928a(26) =2135744a(27) =2689808a(28) =3362600a(29) =4173840