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Call a string of letters legal if it can be produced by concatenating ( running together ) copies of the following strings: ' v '

Call a string of letters "legal" if it can be produced by concatenating (running together) copies of the following strings: 'v','ww','?',yy' and 'zzz'.
For example, the string 'vv' is legal because it can be produced by concatenating '?'',v' and 'v', but the string 'xv' is not legal.
For each integer n1, let tn be the number of legal strings with n letters. For example, t1=1('v' is the only the legal string).
t2=
t3=
tn=atn-1+btn-2+ctn-3 for each integer n4
where a=,b=, and c=
For each integer n1, let pn be the number of legal strings with n letters that also read the same right to left as they do left to right (like 'v?'', for example).
Which of the following expressions is equal to p101?
t50+t48
p50+2p49
t50+2t49
t50+t49
t50+2t48
p100+p99
t100+t99
p50+p49
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