reviewed
approved
proposed
editing
Cf. A054660, A073995-, A073996, A073997, A073998, A073999.
Andrey Zabolotskiy: Earlier today I accidentally approved my own extension of this sequence, so please consider the extension under as proposed for review, like my other drafts (A074446, A074447, A074448, A074449).
0, 0, 1, 4, 12, 40, 144, 512, 1813, 6528, 23808, 87380, 322560, 1198080, 4473647, 16777216, 63160320, 238605640, 904200192, 3435973836, 13089411609, 49977753600, 191219367936, 733007751680, 2814749599332, 10825959997440, 41699995927744, 160842843834660, 621186153185280
Cf. A054660, A073995-A073999.
nonn,more
nonn
Terms a(16) and beyond from Andrey Zabolotskiy, Jul 21 2021
Let x = RootOf( (z^2+ + z+ + 1 ) ) and y = 1+x. Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace x.
Jon E. Schoenfield: I accidentally approved this after removing keyword:easy … was that removal okay?