def sus5cola(n):
return suscolaux(n,2,3,4)
def suscolaux(n,acu,s,t):
if n == 0: return acu
if n == 1: return s
if n == 2: return t
return suscolaux(n-1,acu+(((acu*2)+s+t)),s,t)
print(sus5cola(7))
ZGVmIHN1czVjb2xhKG4pOgoJcmV0dXJuIHN1c2NvbGF1eChuLDIsMyw0KQpkZWYgc3VzY29sYXV4KG4sYWN1LHMsdCk6CglpZiBuID09IDA6IHJldHVybiBhY3UKCWlmIG4gPT0gMTogcmV0dXJuIHMKCWlmIG4gPT0gMjogcmV0dXJuIHQKCXJldHVybiBzdXNjb2xhdXgobi0xLGFjdSsoKChhY3UqMikrcyt0KSkscyx0KQpwcmludChzdXM1Y29sYSg3KSk=