Help Sammy please...

He was in the library checking books when he somehow knocked an ENTIRE SHELF OVER!!! There are 13 books scattered on the floor. 3 are Red, 4 Orange, 1 Yellow,3 Green, and 2 Blue. The positions are numbered 1 through 13. This is what Sammy remembers from when he walked past the shelf:

"Yo, So, there were 4 Orange books evenly spaced 2 books apart. If I add up their position numbers, it equals 36....I'm pretty sure.....

But the blue books have 3 other books in between them. That, I can remember.

Also, 2 red books were right next to each other. I thought it was one big book at first. Also, these 2 were not at either end.

The Yellow book is the only book between an orange and green book. I don't know if it went G Y O or O Y G though....

Oh! Lastly, 1 red book and 1 green book are at either end."

With these hints, can you help Sammy put the bookshelf back in order? What is the order of the books?