Patterns+and+Algebra+sites

[|Spooky sequences by 1s (only up to 30)] [|Spooky sequences by 1s (up to 100)]  [|Spooky sequences by 2s]  [|Spooky sequences by 5s] [|Spooky sequences by 1s (only up to 10)] [|Spooky sequences by 10s] [|Spooky sequences back by 1s] [|Spooky sequences back by 2s] [|Spooky sequences back by 5s] [|Spooky sequences back by 10s]

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