a(n) = A115004(2n+1).

Terms

a(0) =1a(1) =31a(2) =179a(3) =585a(4) =1463a(5) =3065a(6) =5729a(7) =9797a(8) =15737a(9) =24087a(10) =35315a(11) =50073a(12) =69025a(13) =92871a(14) =122475a(15) =158681a(16) =202529a(17) =254597a(18) =315957a(19) =387977a(20) =471589a(21) =568227a(22) =678971a(23) =805241a(24) =948515a(25) =1109675a(26) =1290839a(27) =1493127a(28) =1717571a(29) =1966997