# A076507 (b-file synthesized from sequence entry) 1 2 2 6 3 8 4 32 5 144 6 192 7 768 8 3456 9 4608 10 18432 11 82944 12 110592 13 442368 14 1990656 15 2654208 16 10616832 17 47775744 18 63700992 19 254803968 20 1146617856 21 1528823808 22 6115295232 23 27518828544 24 36691771392 25 146767085568 26 660451885056