a(1)=1, a(n) = a(n-1) + n^4 if n odd, a(n) = a(n-1) + n^0 if n is even.

Terms

a(0) =1a(1) =2a(2) =83a(3) =84a(4) =709a(5) =710a(6) =3111a(7) =3112a(8) =9673a(9) =9674a(10) =24315a(11) =24316a(12) =52877a(13) =52878a(14) =103503a(15) =103504a(16) =187025a(17) =187026a(18) =317347a(19) =317348a(20) =511829a(21) =511830a(22) =791671a(23) =791672a(24) =1182297a(25) =1182298a(26) =1713739a(27) =1713740a(28) =2421021a(29) =2421022