Number of different isotemporal classes of diasters with n peripheral edges.

Terms

a(0) =1a(1) =1a(2) =4a(3) =7a(4) =15a(5) =23a(6) =38a(7) =53a(8) =77a(9) =101a(10) =136a(11) =171a(12) =219a(13) =267a(14) =330a(15) =393a(16) =473a(17) =553a(18) =652a(19) =751a(20) =871a(21) =991a(22) =1134a(23) =1277a(24) =1445a(25) =1613a(26) =1808a(27) =2003a(28) =2227a(29) =2451