# A013138 (b-file synthesized from sequence entry) 0 1 1 -4 2 16 3 -448 4 14592 5 -705536 6 65245184 7 -5385535488 8 910402060288 9 -124371776831488 10 30930578556583936 11 -6638266678020931584 12 2186545615284171964416 13 -694382737827711997181952