# A337060 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 8 4 46 5 324 6 2708 7 26424 8 295272 9 3714600 10 51929472 11 798610416 12 13399081584 13 243556758912 14 4767863027328 15 100004300847744 16 2237419620187776 17 53187370914349440 18 1338737435337261312 19 35568441673932566016 20 994744655047298951424 21 29211127285363209561600