11811: Near Repdigit Palindrome 11..11811..11

First few terms (base 10): \[[1^*81^*_9]_n=\{8,154,7948,602974,48473488,\ldots\}\]

First few terms (base 9): \[\{\text{8},\text{181},\text{11811},\text{1118111},\text{111181111},\ldots\}\]

General Formula:\[[1^*81^*_9]_n={9\cdot9^{2n}+56\cdot9^{n}-1\over8}\]

Equivalent Patterns: (none)

Table

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