# A268042 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 20 4 57 5 166 6 538 7 1762 8 6045 9 21040 10 74628 11 267598 12 970134 13 3544416 14 13043650 15 48283236 16 179665425 17 671564330 18 2520312810 19 9492124534 20 35863942748 21 135893383596 22 516258841134 23 1965906973886 24 7502329984510 25 28687263026656 26 109893836400756 27 421684916479018