A binary sequence: 1, 3, 7, 15, 31, 63, 126, 252, 505, 1010, 2021, 11111100101 (How to continue the sequence?) > From: Bob Lyons > Subject: [seqfan] Happy 10 - 9 + 8 * 7 * 6! / 5 / 4 + 3! / 2 + 1! > Date: 31 December 2020 at 16:22:24 GMT > To: seqfan - Sequence Fanatics <seqfan at list.seqfan.eu> > > Happy New Year, Sequence Fanatics!