I've just had Sequence A256275 accepted for inclusion in the Online Encyclopedia of Integer Sequences (OEIS) - see https://oeis.org/A256275. The OEIS is the go-to place for checking integer sequences.
| A256275 Decimal equivalent of the binary string generated by the negation of the n x n identity matrix. | | |
0, 6, 238, 31710, 16510910, 34089189246, 280371153272574, 9205322385119247870, 1207744073945406663293950, 633515663914742881158342637566, 1328903397983747395279166325955489790, 11149011303623843458013522930838119932485630, 374121581799746201009538413109130562019709006364670
There are at least 2 other sequences that have Mathcad entries (and look as if they were first created in Mathcad):
A081623 - OEIS
A125089 - OEIS
Stuart
