# A162428 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 8 4 16 5 37 6 87 7 210 8 523 9 1352 10 3579 11 9715 12 26956 13 76367 14 220408 15 648044 16 1940191 17 5907256 18 18279257 19 57449874 20 183261022 21 592970009 22 1945136089 23 6465415945 24 21764630304 25 74168652771 26 255759582378 27 892121078978