Make a foundation chain of 117 chains or multiple of 6 chains plus 9 additional chains.
1st row - insert a hook into the 4th chain from the hook, dc2, ch1, sk1, [dc5, ch1, sk1] to last 3chs; dc3 + RC1
2nd row - insert a hook into the 2nd chain from the hook, sc3, ch1, sk1, [sc5, ch1, sk1] to last 3 chs; sc3 + RC2
3rd row - insert a hook into the 4th chain from the hook, dc2, ch1, sk1, [fp dtrc 1, dc3, fp trdc 1, ch1, sk1] to last 3 chs; dc3 + RC1
Repeat the pattern starting from the 2nd row until your crochet the desired length of the blanket.
Borders
Finish your last row as your second row, then single crochet other three sides also.
1st round - [ch1, sk2, [(unfinished trc1 + hdc1), ch2] x 2, (unfinished trc1 + hdc1), ch1, sk2, sl.st.1] to end
2nd round - reverse sc to end