# A013037 (b-file synthesized from sequence entry) 0 1 1 -4 2 0 3 96 4 896 5 -9344 6 -1723392 7 -271324928 8 -59548864512 9 -16721045069824 10 -5792347300708352 11 -2434568360083357696 12 -1224114312879536340992 13 -726747927831228516990976