Sum 2^((k^2+3k)/2) from k=1 to n.A178184Sum 2^((k^2+3k)/2) from k=1 to n.Terms a(0) =4a(1) =36a(2) =548a(3) =16932a(4) =1065508a(5) =135283236a(6) =34495021604External referencesoeis: A178184