A377626 Cogrowth sequence of the 12-element group A4 = .

1, 0, 1, 1, 1, 5, 4, 14, 21, 43, 91, 165, 354, 676, 1373, 2741, 5445, 10965, 21808, 43738, 87381, 174735, 349647, 698901, 1398318, 2796080, 5592445, 11185081, 22369145, 44740069, 89477724, 178957606, 357914197, 715826739, 1431658435, 2863308229, 5726626746

Offset: 0

Author

Sean A. Irvine, Nov 02 2024

Keywords

• nonn
• easy

Examples

			a(6)=4 corresponds to the words SSSSSS = TTTTTT = STSTST = TSTSTS = 1.
		

Crossrefs

Cf. A007583 (D6), A377627 (C6 x C2), A377656 (Dic2).