# A161474 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 3 4 4 5 5 6 18 7 28 8 40 9 162 10 280 11 440 12 1944 13 3640 14 6160 15 29160 16 58240 17 104720 18 524880 19 1106560 20 2094400 21 11022480 22 24344320 23 48171200 24 264539520 25 608608000 26 1252451200 27 7142567040 28 17041024000 29 36321084800 30 214277011200 31 528271744000 32 1162274713600