# A097948 (b-file synthesized from sequence entry) 0 -1 1 4 2 -13 3 49 4 -181 5 676 6 -2521 7 9409 8 -35113 9 131044 10 -489061 11 1825201 12 -6811741 13 25421764 14 -94875313 15 354079489 16 -1321442641 17 4931691076 18 -18405321661 19 68689595569 20 -256353060613 21 956722646884 22 -3570537526921 23 13325427460801 24 -49731172316281 25 185599261804324