The central polygonal numbers

HTTP/1.1 500 Internal Server Error Date: Sat, 27 Jul 2024 13:41:05 GMT Server: CL-HTTP/70.217 (LispWorks; 2.1.7) Connection: close Content-Type: text/html; charset=ISO-8859-1 Transfer-Encoding: chunked Internal Server Error

Internal Server Error

No applicable methods for #<STANDARD-GENERIC-FUNCTION NUMBERS::APPLY-FN 216F867A> with args (1 0 NIL 1 :QUADRATIC (1 1/2 1/2))

Identifont