A301844Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.
8, 128, 773, 5748, 39703, 281758, 1986213, 14047365, 99396932, 703490647, 4979239708, 35242914039, 249447707376, 1765580587312, 12496708381182, 88451201375638, …
The first 2 terms appear at position 147.
14159265358979323846264338327950288…
…3844609550582231725359408128481117450284102701938521…
…5588296875441514123544318128773864464004484796900186772…
| terms | string | first position | occurrences |
|---|---|---|---|
| 1 | 8 | 11 | 100,001,839 |
| 2 | 8128 | 147 | 99,813 |
| 3 | 8128773 | 13,085,462 | 100 |
| 4 | 81287735748 | not within 1,000,000,000 | 0 |
Searched the first 1,000,000,000 digits. Strings longer than 12 digits are not indexed.