a(n) = 24*A138879(n) - A187219(n).

Terms

a(0) =23a(1) =71a(2) =119a(3) =262a(4) =358a(5) =740a(6) =932a(7) =1697a(8) =2248a(9) =3588a(10) =4690a(11) =7371a(12) =9312a(13) =13814a(14) =17959a(15) =25289a(16) =32406a(17) =45056a(18) =57015a(19) =77383a(20) =98043a(21) =129678a(22) =163451a(23) =214120a(24) =267217a(25) =344786a(26) =429842a(27) =547308a(28) =677897a(29) =856601