# A271893 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 22 4 58 5 156 6 412 7 1100 8 2912 9 7752 10 20552 11 54640 12 144976 13 385200 14 1022464 15 2715872 16 7210400 17 19149504 18 50845376 19 135026368 20 358537216 21 952107648 22 2528205952 23 6713619200 24 17827416320 25 47340073728 26 125708097536 27 333811992064 28 886415931904 29 2353831246848 30 6250454268928 31 16597737933824