# A149340 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 40 5 154 6 590 7 2291 8 9523 9 39351 10 164720 11 711336 12 3073150 13 13376333 14 59305585 15 263251753 16 1174914851 17 5305026397 18 23991323059 19 108935348192 20 498558014381 21 2285348450639 22 10508708646670 23 48595333492782 24 225057299921016 25 1044912400895195 26 4871739738152142 27 22745133446781661