The numbers appearing in the first layer of the number stack in A370193.

Terms

a(0) =1a(1) =3a(2) =10a(3) =21a(4) =36a(5) =78a(6) =136a(7) =210a(8) =406a(9) =666a(10) =1176a(11) =2080a(12) =3240a(13) =5460a(14) =8256a(15) =14196a(16) =21736a(17) =39340a(18) =64980a(19) =119316a(20) =190036a(21) =339900a(22) =533028a(23) =830116a(24) =1452660a(25) =2248260a(26) =3899028a(27) =6001380a(28) =10073316a(29) =17009028