# A084219 (b-file synthesized from sequence entry) 0 1 1 -1 2 4 3 -8 4 20 5 -44 6 100 7 -220 8 484 9 -1052 10 2276 11 -4892 12 10468 13 -22300 14 47332 15 -100124 16 211172 17 -444188 18 932068 19 -1951516 20 4077796 21 -8505116 22 17709284 23 -36816668 24 76429540 25 -158451484 26 328087780 27 -678545180 28 1401829604