a(n) = (d(n)-r(n))/2, where d = A026037 and r is the periodic sequence with fundamental period (1,0,0,1).

A026038

a(n) = (d(n)-r(n))/2, where d = A026037 and r is the periodic sequence with fundamental period (1,0,0,1).

Terms

    a(0) =5a(1) =11a(2) =20a(3) =33a(4) =52a(5) =78a(6) =111a(7) =152a(8) =203a(9) =265a(10) =338a(11) =423a(12) =522a(13) =636a(14) =765a(15) =910a(16) =1073a(17) =1255a(18) =1456a(19) =1677a(20) =1920a(21) =2186a(22) =2475a(23) =2788a(24) =3127a(25) =3493a(26) =3886a(27) =4307a(28) =4758a(29) =5240

External references