# A024275 (b-file synthesized from sequence entry) 0 0 1 1 2 -6 3 116 4 -4816 5 342736 6 -37272576 7 5748462656 8 -1193465153536 9 320935235205376 10 -108513125117853696 11 45057835625375568896 12 -22540295648947188269056 13 13370560809273727964041216