# A009544 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 2 4 -8 5 -44 6 8 7 944 8 2304 9 -27632 10 -183776 11 975072 12 15141248 13 -27882048 14 -1461427328 15 -1986004224 16 166452797440 17 850359527680 18 -21941424508416 19 -222801125934592 20 3231615038191616 21 57863671042155520