# A081051 (b-file synthesized from sequence entry) 0 0 1 0 2 1 3 -6 4 35 5 -225 6 1624 7 -13132 8 118124 9 -1172700 10 12753576 11 -150917976 12 1931559552 13 -26596717056 14 392156797824 15 -6165817614720 16 102992244837120 17 -1821602444624640 18 34012249593822720 19 -668609730341153280 20 13803759753640704000 21 -298631902863216384000