# A025590 (b-file synthesized from sequence entry) 0 1 1 2 2 10 3 44 4 156 5 572 6 2086 7 7254 8 23842 9 76764 10 234456 11 690902 12 1912462 13 5115272 14 12643292 15 30128464 16 65353058 17 136831514 18 256926694 19 466887564 20 749958636 21 1169595430 22 1586374020 23 2094918528 24 2360469300 25 2592155202 26 2368114810