# A009452 (b-file synthesized from sequence entry) 0 0 1 1 2 -1 3 3 4 -8 5 26 6 -46 7 -542 8 12272 9 -196204 10 2970284 11 -46125412 12 747689152 13 -12796612984 14 231568711464 15 -4435090726232 16 89781803413632 17 -1918433012222064 18 43187041330469744 19 -1022364892192828752