# A261980 (b-file synthesized from sequence entry) 0 1 1 2 2 -2 3 -4 4 14 5 24 6 -92 7 -176 8 694 9 1342 10 -5480 11 -10612 12 44532 13 86408 14 -369328 15 -717616 16 3109078 17 6046724 18 -26473950 19 -51523620 20 227477656 21 442950880 22 -1969014572 23 -3835720208 24 17147433572 25 33415180858 26 -150096433272 27 -292574352808 28 1319581377424 29 2572787175656 30 -11644937717296