"Model 2" for number of free alkanes on n points.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =35a(5) =109a(6) =347a(7) =1105a(8) =3507a(9) =11135a(10) =35371a(11) =112343a(12) =356797a(13) =1133207a(14) =3599143a(15) =11431063a(16) =36305649a(17) =115308721a(18) =366226729a(19) =1163155753a(20) =3694245273a(21) =11733121945a(22) =37265026883a(23) =118355731271a(24) =375904173873